strstr函数作用

strstr函数的作用是在一个字符串中查找另一个字符串的出现位置。它的功能是从字符串str1中查找是否有字符串str2，如果有，则返回指向第一次出现的位置的指针。如果没有找到，则返回NULL。
例如，下面是一个使用strstr函数的简单示例代码：

#include <stdio.h>
#include <string.h>

int main() {
   char str1[] = "hello world";
   char str2[] = "world";
   char *result = strstr(str1, str2);
   
   if (result != NULL) {
      printf("'%s' was found in '%s'\n", str2, str1);
      printf("'%s' starts at index %ld\n", result, result - str1);
   } else {
      printf("'%s' was not found in '%s'\n", str2, str1);
   }
   
   return 0;
}

这段代码会在字符串"hello world"中查找"world"，如果找到了，则会输出"'world' was found in 'hello world'"并显示出"world"的起始索引位置。如果没有找到，则会输出"'world' was not found in 'hello world'"。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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