从小写到大写——一个有趣的事实-yiteyi-C++库

问题：给定一个只包含小写字母的字符串，生成一个字母相同但大写的字符串。

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Input : GeeksForGeeksOutput : GEEKSFORGEEKS

建议：请在“上解决” 实践 “首先，在讨论解决方案之前。

我们想到的第一个方法是

C++

                         // C++ program to convert a string to uppercase                       
                         #include <iostream>                       
                         using                                     namespace                                     std;                       
           
                         // Converts a string to uppercase                       
                         string to_upper(string &in)                       
                         {                       
                                                 for                                     (                                     int                                     i = 0; i < in.length(); i++)                       
                                                 if                                     (                                     'a'                                     <= in[i] <=                                     'z'                                     )                       
                                                 in[i] = in[i] -                                     'a'                                     +                                     'A'                                     ;                       
                                                 return                                     in;                       
                         }                       
           
                         // Driver code                       
                         int                                     main()                       
                         {                       
                                                 string str =                                     "geeksforgeeks"                                     ;                       
                                                 cout << to_upper(str);                       
                                                 return                                     0;                       
                         }                       

JAVA

                         // Java program to convert a string to uppercase                       
           
                         class                                     GFG                       
                         {                       
           
                                                 // Converts a string to uppercase                       
                                                 static                                     String to_upper(                                     char                                     [] in)                       
                                                 {                       
                                                 for                                     (                                     int                                     i =                                     0                                     ; i < in.length; i++)                       
                                                 {                       
                                                 if                                     (                                     'a'                                     <= in[i] & in[i] <=                                     'z'                                     )                       
                                                 {                       
                                                 in[i] = (                                     char                                     ) (in[i] -                                     'a'                                     +                                     'A'                                     );                       
                                                 }                       
                                                 }                       
                                                 return                                     String.valueOf(in);                       
                                                 }                       
           
                                                 // Driver code                       
                                                 public                                     static                                     void                                     main(String[] args)                       
                                                 {                       
                                                 String str =                                     "geeksforgeeks"                                     ;                       
                                                 System.out.println(to_upper(str.toCharArray()));                       
                                                 }                       
                         }                       
           
                         // This code is contributed by PrinciRaj1992                       

Python3

                         # Python3 program to convert a string to uppercase                       
           
                         # Converts a string to uppercase                       
                         def                                     to_upper(string):                       
                                                 for                                     i                                     in                                     range                                     (                                     len                                     (string)):                       
                                                 if                                     (                                     'a'                                     <                                     =                                     string[i] <                                     =                                     'z'                                     ):                       
                                                 string                                     =                                     (string[                                     0                                     :i]                                     +                                     chr                                     (                                     ord                                     (string[i])                                     -                       
                                                 ord                                     (                                     'a'                                     )                                     +                                     ord                                     (                                     'A'                                     ))                                     +                       
                                                 string[i                                     +                                     1                                     :])                       
                                                 return                                     string;                       
           
                         # Driver code                       
                         if                                     __name__                                     =                                     =                                     '__main__'                                     :                       
                                                 str                                     =                                     "geeksforgeeks"                                     ;                       
                                                 print                                     (to_upper(                                     str                                     ));                       
           
                         # This code is contributed by Rajput-Ji                       

C#

                         // C# program to convert a string to uppercase                       
                         using                                     System;                       
           
                         class                                     GFG                       
                         {                       
                                                 // Converts a string to uppercase                       
                                                 static                                     String to_upper(                                     char                                     []In)                       
                                                 {                       
                                                 for                                     (                                     int                                     i = 0; i < In.Length; i++)                       
                                                 {                       
                                                 if                                     (                                     'a'                                     <= In[i] & In[i] <=                                     'z'                                     )                       
                                                 {                       
                                                 In[i] = (                                     char                                     ) (In[i] -                                     'a'                                     +                                     'A'                                     );                       
                                                 }                       
                                                 }                       
                                                 return                                     String.Join(                                     ""                                     , In);                       
                                                 }                       
           
                                                 // Driver code                       
                                                 public                                     static                                     void                                     Main()                       
                                                 {                       
                                                 String str =                                     "geeksforgeeks"                                     ;                       
                                                 Console.WriteLine(to_upper(str.ToCharArray()));                       
                                                 }                       
                         }                       
           
                         // This code is contributed by 29AjayKumar                       

Javascript

                         <script>                       
                                                 // JavaScript program to convert a string to uppercase                       
                                                 // Converts a string to uppercase                       
                                                 function                                     to_upper(input)                       
                                                 {                       
                                                 var                                     result =                                     new                                     Array(input.length);                       
                                                 for                                     (                                     var                                     i = 0; i < input.length; i++)                       
                                                 if                                     (                                     "a"                                     .charCodeAt(0) <= input[i].charCodeAt(0) <=                                     "z"                                     .charCodeAt(0))                       
                                                 result[i] = String.fromCharCode(                       
                                                 input[i].charCodeAt(0) -                                     "a"                                     .charCodeAt(0) +                                     "A"                                     .charCodeAt(0)                       
                                                 );                       
           
                                                 return                                     result.join(                                     ""                                     ).toString();                       
                                                 }                       
           
                                                 // Driver code                       
                                                 var                                     str =                                     "geeksforgeeks"                                     ;                       
                                                 document.write(to_upper(str));                       
                                   
                                                 // This code is contributed by rdtank.                       
                                                 </script>                       

输出：

GEEKSFORGEEKS

另一方面，一个更有趣的解决方案是：

C++

                         // C++ program to convert a string to uppercase                       
                         #include <iostream>                       
                         using                                     namespace                                     std;                       
           
                         // Converts a string to uppercase                       
                         string to_upper(string &in)                       
                         {                       
                                                 for                                     (                                     int                                     i = 0; i < in.length(); i++)                       
                                                 if                                     (                                     'a'                                     <= in[i] <=                                     'z'                                     )                       
                                                 in[i] &= ~(1 << 5);                       
                                                 return                                     in;                       
                         }                       
           
                         // Driver code                       
                         int                                     main()                       
                         {                       
                                                 string str =                                     "geeksforgeeks"                                     ;                       
                                                 cout << to_upper(str);                       
                                                 return                                     0;                       
                         }                       

JAVA

                         // Java program to convert a string to uppercase                       
                         class                                     GFG                       
                         {                       
           
                         // Converts a string to uppercase                       
                         static                                     String to_upper(                                     char                                     [] in)                       
                         {                       
                                                 for                                     (                                     int                                     i =                                     0                                     ; i < in.length; i++)                       
                                                 if                                     (                                     'a'                                     <= in[i] && in[i] <=                                     'z'                                     )                       
                                                 in[i] &= ~(                                     1                                     <<                                     5                                     );                       
                                                 return                                     String.valueOf(in);                       
                         }                       
           
                         // Driver code                       
                         public                                     static                                     void                                     main(String[] args)                       
                         {                       
                                                 String str =                                     "geeksforgeeks"                                     ;                       
                                                 System.out.println(to_upper(str.toCharArray()));                       
                         }                       
                         }                       
           
                         // This code is contributed by Rajput-Ji                       

Python3

                         # Python3 program to convert                       
                         # a string to uppercase                       
           
                         # Converts a string to uppercase                       
                         def                                     to_upper(s):                       
                                                 for                                     i                                     in                                     range                                     (                                     len                                     (s)):                       
                                                 if                                     (                                     'a'                                     <                                     =                                     s[i] <                                     =                                     'z'                                     ):                       
                                                 s                                     =                                     s[                                     0                                     :i]                                     +                                     chr                                     (                                     ord                                     (s[i]) &                       
                                                 (~(                                     1                                     <<                                     5                                     )))                                     +                                     s[i                                     +                                     1                                     :];                       
                                                 return                                     s;                       
           
                         # Driver code                       
                         if                                     __name__                                     =                                     =                                     '__main__'                                     :                       
                                                 string                                     =                                     "geeksforgeeks"                                     ;                       
                                                 print                                     (to_upper(string));                       
           
                         # This code is contributed by PrinciRaj1992                       

C#

                         // C# program to convert a string to uppercase                       
                         using                                     System;                       
           
                         class                                     GFG                       
                         {                       
           
                         // Converts a string to uppercase                       
                         static                                     String to_upper(                                     char                                     [] str)                       
                         {                       
                                                 for                                     (                                     int                                     i = 0; i < str.Length; i++)                       
                                                 if                                     (                                     'a'                                     <= str[i] && str[i] <=                                     'z'                                     )                       
                                                 str[i] = (                                     char                                     )((                                     int                                     )str[i]&(~(1 << 5)));                       
                                                 return                                     String.Join(                                     ""                                     , str);                       
                         }                       
           
                         // Driver code                       
                         public                                     static                                     void                                     Main(String[] args)                       
                         {                       
                                                 String str =                                     "geeksforgeeks"                                     ;                       
                                                 Console.WriteLine(to_upper(str.ToCharArray()));                       
                         }                       
                         }                       
           
                         // This code is contributed by PrinciRaj1992                       

Javascript

                         <script>                       
           
                         // Javascript program to convert                       
                         // a string to uppercase                       
           
                         // Converts a string to uppercase                       
                         function                                     to_upper(In)                       
                         {                       
                                                 let n = In.length;                       
                                                 for                                     (let i = 0; i < In.length; i++)                       
                                                 if                                     (                                     'a'                                     <= In[i] && In[i] <=                                     'z'                                     )                       
                                                 In[i] = String.fromCharCode(                       
                                                 In[i].charCodeAt(0) & (~(1 << 5)));                       
                                   
                                                 return                                     (In).join(                                     ""                                     );                       
                         }                       
           
                         // Driver code                       
                         let str =                                     "geeksforgeeks"                                     ;                       
           
                         document.write(to_upper(str.split(                                     ""                                     )));                       
           
                         // This code is contributed by rag2127                       
           
                         </script>                       