打印最后N行的程序| Set-2-yiteyi-C++库

给定一个字符串中的一些文本行，每行之间用’“性格。打印最后N行。如果行数小于N，则打印所有行。

null

C++

                         // C++ program to print the last N lines                       
                         #include <bits/stdc++.h>                       
                         using                                     namespace                                     std;                       
                                   
                         void                                     PrintLast(string s,                                     int                                     t)                       
                         {                       
                                                 // Vector to store individual strings.                       
                                                 vector<string> v;                       
                                   
                                                 // Get a pointer to string.                       
                                                 char                                     * str = &s[0];                       
                                                 // Split the string around ''.                       
                                                 char                                     * token =                                     strtok                                     (str,                                     ""                                     );                       
                                   
                                                 // Save all strings in the vector.                       
                                                 while                                     (token) {                       
                                                 v.push_back(token);                       
                                                 token =                                     strtok                                     (NULL,                                     ""                                     );                       
                                                 }                       
                                   
                                                 if                                     (v.empty()) {                       
                                                 cout <<                                     "ERROR: string doesn't contain '\n' character"                                     ;                       
                                                 return                                     ;                       
                                                 }                       
                                   
                                                 // If the string has t lines                       
                                                 if                                     (v.size() >= t) {                       
                                                 for                                     (                                     int                                     i = v.size() - t; i < v.size(); i++)                       
                                                 cout << v[i] << endl;                       
                                                 }                       
                                                 else                                     {                       
                                                 for                                     (                                     int                                     i = 0; i < v.size(); i++)                       
                                                 cout << v[i] << endl;                       
                                                 }                       
                         }                       
                                   
                         // Driver Code                       
                         int                                     main()                       
                         {                       
                                                 string s1 =                                     "str1str2str3str4str5str6str7str8str9"                       
                                                 "str10str11str12str13str14str15str16str17"                       
                                                 "str18str19str20str21str22str23str24str25"                                     ;                       
                                                 int                                     n = 10;                       
                                                 PrintLast(s1, n);                       
                                   
                                                 return                                     0;                       
                         }                       

JAVA

                         // Java program to print the last N lines                       
                         import                                     java.util.*;                       
                                   
                         class                                     GFG                       
                         {                       
                                                 static                                     void                                     printLast(String s,                                     int                                     t)                       
                                                 {                       
                                   
                                                 // Vector to store individual strings.                       
                                                 // Save all strings in the vector.                       
                                                 String[] v = s.split(                                     ""                                     );                       
                                   
                                                 if                                     (v.length ==                                     0                                     )                       
                                                 {                       
                                                 System.out.println(                                     "ERROR: string doesn't "                                     +                       
                                                 "contain '\n' character"                                     );                       
                                                 return                                     ;                       
                                                 }                       
                                   
                                                 // If the string has t lines                       
                                                 if                                     (v.length >= t)                       
                                                 {                       
                                                 for                                     (                                     int                                     i = v.length - t; i < v.length; i++)                       
                                                 {                       
                                                 System.out.println(v[i]);                       
                                                 }                       
                                                 }                       
                                                 else                       
                                                 {                       
                                                 for                                     (                                     int                                     i =                                     0                                     ; i < v.length; i++)                       
                                                 {                       
                                                 System.out.println(v[i]);                       
                                                 }                       
                                                 }                       
                                                 }                       
                                   
                                                 // Driver Code                       
                                                 public                                     static                                     void                                     main(String[] args)                       
                                                 {                       
                                                 String s1 =                                     "str1str2str3str4str5str6str7"                                     +                       
                                                 "str8str9str10str11str12str13"                                     +                       
                                                 "str14str15str16str17str18str19"                                     +                       
                                                 "str20str21str22str23str24str25"                                     ;                       
                                                 int                                     n =                                     10                                     ;                       
                                                 printLast(s1, n);                       
                                                 }                       
                         }                       
                                   
                         // This code is contributed by                       
                         // sanjeev2552                       

Python3

                         # Python3 program to print the last N lines                       
                         def                                     PrintLast(s, t):                       
                                   
                                                 # Vector to store individual strings.                       
                                                 v                                     =                                     s.split(                                     ''                                     )                       
                                   
                                                 if                                     len                                     (v)                                     =                                     =                                     0                                     :                       
                                                 print                                     (                                     "ERROR: string doesn't "                                     ,                       
                                                 "contain '\n' character"                                     )                       
                                                 return                       
                                   
                                                 # If the string has t lines                       
                                                 elif                                     len                                     (v) >                                     =                                     t:                       
                                                 for                                     i                                     in                                     range                                     (                                     len                                     (v)                                     -                                     t,                                     len                                     (v)):                       
                                                 print                                     (v[i])                       
                                   
                                                 else                                     :                       
                                                 for                                     i                                     in                                     range                                     (                                     0                                     ,                                     len                                     (v)):                       
                                                 print                                     (v[i])                       
                                   
                         # Driver Code                       
                         if                                     __name__                                     =                                     =                                     "__main__"                                     :                       
                                   
                                                 s1                                     =                                     "str1str2str3str4str5str6"                                     +                                               
                                                 "str7str8str9str10str11"                                     +                                               
                                                 "str12str13str14str15str16"                                     +                                               
                                                 "str17str18str19str20str21"                                     +                                               
                                                 "str22str23str24str25"                       
                                   
                                                 n                                     =                                     10                       
                                                 PrintLast(s1, n)                       
                                   
                         # This code is contributed by Rituraj Jain                       

C#

                         // C# program to print the last N lines                       
                         using                                     System;                       
                                   
                         class                                     GFG                       
                         {                       
                                                 static                                     void                                     printLast(String s,                                     int                                     t)                       
                                                 {                       
                                   
                                                 // List to store individual strings.                       
                                                 // Save all strings in the vector.                       
                                                 String[] v = s.Split(                                     ''                                     );                       
                                   
                                                 if                                     (v.Length == 0)                       
                                                 {                       
                                                 Console.WriteLine(                                     "ERROR: string doesn't "                                     +                       
                                                 "contain '\n' character"                                     );                       
                                                 return                                     ;                       
                                                 }                       
                                   
                                                 // If the string has t lines                       
                                                 if                                     (v.Length >= t)                       
                                                 {                       
                                                 for                                     (                                     int                                     i = v.Length - t; i < v.Length; i++)                       
                                                 {                       
                                                 Console.WriteLine(v[i]);                       
                                                 }                       
                                                 }                       
                                                 else                       
                                                 {                       
                                                 for                                     (                                     int                                     i = 0; i < v.Length; i++)                       
                                                 {                       
                                                 Console.WriteLine(v[i]);                       
                                                 }                       
                                                 }                       
                                                 }                       
                                   
                                                 // Driver Code                       
                                                 public                                     static                                     void                                     Main(String[] args)                       
                                                 {                       
                                                 String s1 =                                     "str1str2str3str4str5str6str7"                                     +                       
                                                 "str8str9str10str11str12str13"                                     +                       
                                                 "str14str15str16str17str18str19"                                     +                       
                                                 "str20str21str22str23str24str25"                                     ;                       
                                                 int                                     n = 10;                       
                                                 printLast(s1, n);                       
                                                 }                       
                         }                       
                                   
                         // This code is contributed by Rajput-Ji                       

输出：

str16
str17
str18
str19
str20
str21
str22
str23
str24
str25

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打印最后N行的程序| Set-2

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C++

JAVA

Python3

C#