查找字符串中一个子串的个数

#include <stdio.h>#include <string.h>int find_str( char *str, char *des );void main(){char str[40],des[10];int n;gets( str );gets( des );n = find_str( str, des );printf("%d/n",n);}int find_str( char *str, char *des ){int n=0,i,len;char *p;len = strlen( des );if ( len == 0 )return( n );else {for ( p=des; *str!='/0'; str++ ){ if ( *str == *p ) p++; else p = des; if ( *p == '/0' ){ n++; p = des;}} return( n );}}