输入一个字符串,计算字符串中子串出现的次数

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

int fun(char *a, char *b)
{
	int len_b;
	int count = 0;//计数子串个数
	int num = 0;//计数和b相同字符个数
	char *temp = b;

	len_b = strlen(b);//求b长度

	while (*a != '\0')
	{
		if (*a == *temp)//计数入口字符和b相同
		{
			while ((*a == *temp) && (*a != '\0') && (*temp != '\0'))
			{
				num++;
				a++;
				temp++;
			}
			if (num == len_b)//退出字符个数计数时，和b长度相同则计数字串
			{
				count++;
			}
			num = 0;//重新赋值
			temp = b;//重新指向字串
		}
		else
		{
			a++;
		}
	}

	return count;
}

int main()
{
	char a[100];
	char b[10];
	int num;

	printf("Enter the main string(<=100)!\n");
	scanf("%s",a);
	printf("Enter the substring(<=10)!\n");
	scanf("%s",b);

	num = fun(a,b);

	printf("The number is:%d\n",num);

    return 0;
}