用于查找姓名首字母的程序。-yiteyi-C++库

给定一个字符串名，我们必须找到名称的首字母

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例如：

Input  : prabhat kumar singhOutput : P K SWe take the first letter of allwords and print in capital letter.Input  : Jude LawOutput : J LInput  : abhishek kumar singhOutput : A K S

推荐：请尝试你的方法 {IDE} 首先，在进入解决方案之前。

1）用大写字母打印第一个字符。 2）遍历字符串的其余部分，用大写字母打印空格后的每个字符。

C++

                         // C++ program to print initials of a name                       
                         #include <bits/stdc++.h>                       
                         using                                     namespace                                     std;                       
           
                         void                                     printInitials(                                     const                                     string& name)                       
                         {                       
                                                 if                                     (name.length() == 0)                       
                                                 return                                     ;                       
           
                                                 // Since toupper() returns int, we do typecasting                       
                                                 cout << (                                     char                                     )                                     toupper                                     (name[0]);                       
           
                                                 // Traverse rest of the string and print the                       
                                                 // characters after spaces.                       
                                                 for                                     (                                     int                                     i = 1; i < name.length() - 1; i++)                       
                                                 if                                     (name[i] ==                                     ' '                                     )                       
                                                 cout <<                                     " "                                     << (                                     char                                     )                                     toupper                                     (name[i + 1]);                       
                         }                       
           
                         // Driver code                       
                         int                                     main()                       
                         {                       
                                                 string name =                                     "prabhat kumar singh"                                     ;                       
                                                 printInitials(name);                       
                                                 return                                     0;                       
                         }                       

JAVA

                         // Java program to print initials of a name                       
                         class                                     initials {                       
                                   
                                                 static                                     void                                     printInitials(String name)                       
                                                 {                       
                                                 if                                     (name.length() ==                                     0                                     )                       
                                                 return                                     ;                       
           
                                                 // Since toupper() returns int,                       
                                                 // we do typecasting                       
                                                 System.out.print(Character.toUpperCase(                       
                                                 name.charAt(                                     0                                     )));                       
           
                                                 // Traverse rest of the string and                       
                                                 // print the characters after spaces.                       
                                                 for                                     (                                     int                                     i =                                     1                                     ; i < name.length() -                                     1                                     ; i++)                       
                                                 if                                     (name.charAt(i) ==                                     ' '                                     )                       
                                                 System.out.print(                                     " "                                     + Character.toUpperCase(                       
                                                 name.charAt(i +                                     1                                     )));                       
                                                 }                       
           
                                                 // Driver code                       
                                                 public                                     static                                     void                                     main(String args[])                       
                                                 {                       
                                                 String name =                                     "prabhat kumar singh"                                     ;                       
                                                 printInitials(name);                       
                                                 }                       
                         }                       
           
                         // This code is contributed by Danish Kaleem                       

python

                         # Python program to print                       
                         # initials of a name                       
           
                         # user define function                       
                         def                                     printInitials(name):                       
                                                 if                                     (                                     len                                     (name)                                     =                                     =                                     0                                     ):                       
                                                 return                       
                                                 print                                     (name[                                     0                                     ].upper()),                       
                                                 for                                     i                                     in                                     range                                     (                                     1                                     ,                                     len                                     (name)                                     -                                     1                                     ):                       
                                                 if                                     (name[i]                                     =                                     =                                     ' '                                     ):                       
                                                 print                                     (name[i                                     +                                     1                                     ].upper()),                       
           
                         def                                     main():                       
                                                 name                                     =                                     "Prabhat Kumar Singh"                       
                                                 printInitials(name)                       
           
                         if                                     __name__                                     =                                     =                                     "__main__"                                     :                       
                                                 main()                       
           
                         # This code is contributed                       
                         # by prabhat kumar singh                       

C#

                         // C# program to print initials of a name                       
                         using                                     System;                       
           
                         class                                     initials {                       
                                   
                                                 static                                     void                                     printInitials(String name)                       
                                                 {                       
                                                 if                                     (name.Length == 0)                       
                                                 return                                     ;                       
           
                                                 // Since toupper() returns int,                       
                                                 // we do typecasting                       
                                                 Console.Write(Char.ToUpper(name[0]));                       
           
                                                 // Traverse rest of the string and                       
                                                 // print the characters after spaces.                       
                                                 for                                     (                                     int                                     i = 1; i < name.Length - 1; i++)                       
                                                 if                                     (name[i] ==                                     ' '                                     )                       
                                                 Console.Write(                                     " "                                     + Char.ToUpper(name[i + 1]));                       
                                                 }                       
           
                                                 // Driver code                       
                                                 public                                     static                                     void                                     Main()                       
                                                 {                       
                                                 String name =                                     "prabhat kumar singh"                                     ;                       
                                                 printInitials(name);                       
                                                 }                       
                         }                       
           
                         // This code is contributed by nitin mittal.                       

PHP

                         <?php                       
                         // php program to print initials of a name                       
           
                         function                                     printInitials(                                     $name                                     )                       
                         {                       
                                                 if                                     (                                     strlen                                     (                                     $name                                     ) == 0)                       
                                                 return                                     ;                       
           
                                                 // Since toupper() returns int, we do typecasting                       
                                                 echo                                     strtoupper                                     (                                     $name                                     [0]);                       
           
                                                 // Traverse rest of the string and print the                       
                                                 // characters after spaces.                       
                                                 for                                     (                                     $i                                     = 1;                                     $i                                     <                                     strlen                                     (                                     $name                                     ) - 1;                                     $i                                     ++)                       
                                                 if                                     (                                     $name                                     [                                     $i                                     ] ==                                     ' '                                     )                       
                                                 echo                                     " "                                     .                                     strtoupper                                     (                                     $name                                     [                                     $i                                     + 1]);                       
                         }                       
           
                         // Driver code                       
                         $name                                     =                                     "prabhat kumar singh"                                     ;                       
                         printInitials(                                     $name                                     );                       
           
                         // This code is contributed by Sam007                       
                         ?>                       

Javascript

                         <script>                       
                                                 // Javascript program to print initials of a name                       
                                   
                                                 function                                     printInitials(name)                       
                                                 {                       
                                                 if                                     (name.length == 0)                       
                                                 return                                     ;                       
                                   
                                                 // Since toupper() returns int,                       
                                                 // we do typecasting                       
                                                 document.write(name[0].toUpperCase());                       
                                   
                                                 // Traverse rest of the string and                       
                                                 // print the characters after spaces.                       
                                                 for                                     (let i = 1; i < name.length - 1; i++)                       
                                                 if                                     (name[i] ==                                     ' '                                     )                       
                                                 document.write(                                     " "                                     + name[i + 1].toUpperCase());                       
                                                 }                       
                                   
                                                 let name =                                     "prabhat kumar singh"                                     ;                       
                                                 printInitials(name);                       
                                   
                         </script>                       

输出：

P K S

另一种可能的解决方案如下：

C++

                         // C++ program to solve the above approach                       
                         #include <bits/stdc++.h>                       
                         using                                     namespace                                     std;                       
           
                         void                                     printInitials(string name)                       
                         {                       
                                                 if                                     (name.length() == 0)                       
                                                 return                                     ;                       
           
                                                 // split the string using 'space'                       
                                                 // and print the first character of every word                       
                                                 stringstream X(name);                                     // X is an object of stringstream                       
                                                 // that references the S string                       
           
                                                 // use while loop to check the getline() function                       
                                                 // condition                       
                                                 while                                     (getline(X, name,                                     ' '                                     )) {                       
                                                 /* X represents to read the string from                       
                                                 stringstream, T use for store the token string and,                       
                                                 ' ' whitespace represents to split the string where                       
                                                 whitespace is found. */                       
           
                                                 cout << (                                     char                                     )                                     toupper                                     (name[0])<<                                     " "                                     ;                                     // print split string                       
                                                 }                       
                         }                       
           
                         // Driver code                       
                         int                                     main()                       
                         {                       
                                                 string name =                                     "prabhat kumar singh"                                     ;                       
                                                 printInitials(name);                       
                                                 return                                     0;                       
                         }                       
           
                         // This code is contributed by gauravrajput1                       

JAVA

                         // Java program to print initials of a name                       
                         class                                     initials {                       
                                   
                                                 static                                     void                                     printInitials(String name)                       
                                                 {                       
                                                 if                                     (name.length() ==                                     0                                     )                       
                                                 return                                     ;                       
           
                                                 //split the string using 'space'                       
                                                 //and print the first character of every word                       
                                                 String words[] = name.split(                                     " "                                     );                       
                                                 for                                     (String word : words) {                       
                                                 System.out.print(Character.toUpperCase(word.charAt(                                     0                                     )) +                                     " "                                     );                       
                                                 }                       
                                                 }                       
           
                                                 // Driver code                       
                                                 public                                     static                                     void                                     main(String args[])                       
                                                 {                       
                                                 String name =                                     "prabhat kumar singh"                                     ;                       
                                                 printInitials(name);                       
                                                 }                       
                         }                       

Python3

                         # Python3 program to print initials of a name                       
                         def                                     printInitials(name):                       
                                   
                                                 if                                     (                                     len                                     (name)                                     =                                     =                                     0                                     ):                       
                                                 return                       
           
                                                 # Split the string using 'space'                       
                                                 # and print the first character of                       
                                                 # every word                       
                                                 words                                     =                                     name.split(                                     " "                                     )                       
                                                 for                                     word                                     in                                     words:                       
                                                 print                                     (word[                                     0                                     ].upper(), end                                     =                                     " "                                     )                       
           
                         # Driver code                       
                         if                                     __name__                                     =                                     =                                     '__main__'                                     :                       
                                   
                                                 name                                     =                                     "prabhat kumar singh"                       
                                                 printInitials(name)                       
           
                         # This code is contributed by mohit kumar 29                       

C#

                         // C# program to print initials of a name                       
                         using                                     System;                       
           
                         public                                     class                                     initials {                       
                                   
                                                 static                                     void                                     printInitials(String name)                       
                                                 {                       
                                                 if                                     (name.Length == 0)                       
                                                 return                                     ;                       
           
                                                 //split the string using 'space'                       
                                                 //and print the first character of every word                       
                                                 String []words = name.Split(                                     ' '                                     );                       
                                                 foreach                                     (String word                                     in                                     words) {                       
                                                 Console.Write(                                     char                                     .ToUpper(word[0]) +                                     " "                                     );                       
                                                 }                       
                                                 }                       
           
                                                 // Driver code                       
                                                 public                                     static                                     void                                     Main(String []args)                       
                                                 {                       
                                                 String name =                                     "prabhat kumar singh"                                     ;                       
                                                 printInitials(name);                       
                                                 }                       
                         }                       
           
                         // This code is contributed by gauravrajput1                       

Javascript

                         <script>                       
                         // javascript program to print initials of a name                       
                                                 function                                     printInitials( name) {                       
                                                 if                                     (name.length == 0)                       
                                                 return                                     ;                       
           
                                                 // split the string using 'space'                       
                                                 // and print the first character of every word                       
                                                 var                                     words = name.split(                                     " "                                     );                       
                                   
                                                 words.forEach(myFunction);                       
           
           
                                                 }                       
                                                 function                                     myFunction(item) {                       
                                                 document.write((item[0].toUpperCase()) +                                     " "                                     );                       
                         }                       
           
                                                 // Driver code                       
                                                 var                                     name =                                     "prabhat kumar singh"                                     ;                       
                                                 printInitials(name);                       
           
                         // This code is contributed by gauravrajput1                       
                         </script>                       

输出：

P K S

这段代码的复杂度将小于O（w），其中w是句子中的单词数，这可能比字符串中的字符数好一点。此代码由Anuj Khasgiwala提供我们也可以使用 C/C中的strtok（）函数++ 为了实现这一点。

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