C++ strrchr()用法及代碼示例

C /C++中的strrchr()函數查找字符串中字符的最後一次出現。它返回一個指向字符串中最後一次出現的指針。終止的空字符被視為C字符串的一部分。因此，還可以定位它以檢索指向字符串末尾的指針。它在cstring頭文件中定義。
用法:

const char* strrchr( const char* str, int ch )
            or
char* strrchr( char* str, int ch )

參數：該函數采用兩個強製性參數，如下所述：

str :指定指向要搜索的以空終止的字符串的指針。
ch: 指定要搜索的字符。

返回值：如果找到ch，該函數將返回指向ch的最後位置的指針。如果找不到，它將返回空指針。

以下示例程序旨在說明上述函數：

示例1:

// C++ program to illustrate 
// the strrchr() function 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // Storing it in string array 
    char string[] = "Geeks for Geeks"; 
  
    // The character we've to search for 
    char character = 'k'; 
  
    // Storing in a pointer ptr 
    char* ptr = strrchr(string, character); 
  
    // ptr-string gives the index location 
    if (ptr) 
        cout << "Last position of " << character 
             << " in " << string << " is " << ptr - string; 
  
    // If the character we're searching is not present in the array 
    else
        cout << character << " is not present "
             << string << endl; 
    return 0; 
}

輸出：

Last position of k in Geeks for Geeks is 13

示例2:

// C++ program to illustrate  
// the strrchr() function 
#include <bits/stdc++.h> 
using namespace std; 
  
int main() 
{ 
    // Storing it in string array 
    char string[] = "Geeks for Geeks"; 
    char* ptr; 
  
    // The character we've to search for 
    char character = 'z'; 
  
    // Storing in a pointer ptr 
    ptr = strrchr(string, character); 
  
    // ptr-string gives the index location 
    if (ptr) 
        cout << "Last position of " << character 
             << " in " << string << " is " << ptr - string; 
  
    // If the character we're searching 
    // is not present in the array 
    else
        cout << character << " is not present in "
             << string << endl; 
    return 0; 
}

輸出：

z is not present in Geeks for Geeks

相關用法

注：本文由純淨天空篩選整理自AmanSrivastava1大神的英文原創作品 strrchr() function in C/C++。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。