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/* 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;
}
//This is a sample string
char * strncpy ( char * destination, const char * source, size_t num );
destination必须可写。