Question

请编写程序fun，他的功能统计substr所指子字符串在str所指字符串中出现的次数。

Answer 1

#include <string.h>
int str_count(char *substr, char *str)
{
int sum,len;
char * p;
len = strlen(substr);
if(len<1)
return -1;
for(sum=0,p=str;;)
{
p = strstr(p,substr);
if(p!=NULL)
{
sum++;
p+=len;
}
else
break;
}
return sum;
}

Answer 2

(1) int func(char *str, char *substr) { int count = 0; char *cur = substr; while (*str != '\0') { if (*str == *cur) { while (*cur != '\0') { if (*cur++ == *str++) continue; else break; } if (*cur == '\0') count++; cur = substr; } else { str++; } } return count; }