strstr 函数

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最新推荐文章于 2025-05-26 11:07:14 发布

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分类专栏： CPlusPlus学习文章标签： string include null function c

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本文详细介绍了C++中strstr函数的用法，包括参数、返回值和一个实际应用示例。通过示例演示了如何使用strstr函数搜索并替换字符串。

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function

strstr

const char * strstr ( const char * str1, const char * str2 );
      char * strstr (       char * str1, const char * str2 );

Locate substring

Returns a pointer to the first occurrence of str2 in str1, or a null pointer if str2 is not part of str1.

The matching process does not include the terminating null-characters.

Parameters

str1

C string to be scanned.

str2

C string containing the sequence of characters to match.

Return Value

A pointer to the first occurrence in str1 of any of the entire sequence of characters specified in str2, or a null pointer if the sequence is not present in str1.

Portability

In C, this function is declared as:

char * strstr ( const char *, const char * );
instead of the two overloaded versions provided in C++.

Example

/* strstr example */
#include <stdio.h>
#include <string.h>

int main ()
{
  char str[] ="This is a simple string";
  char * pch;
  pch = strstr (str,"simple");
  strncpy (pch,"sample",6);
  puts (str);
  return 0;
}