strstr 函数

/* 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;}

/* strncpy example */#include <stdio.h>#include <string.h>int main (){  char str1[]= "To be or not to be";  char str2[40];  char str3[40];  /* copy to sized buffer (overflow safe): */  strncpy ( str2, str1, sizeof(str2) );  /* partial copy (only 5 chars): */  strncpy ( str3, str2, 5 );  str3[5] = '\0';   /* null character manually added */  puts (str1);  puts (str2);  puts (str3);  return 0;}