输出一个字符串中含有所规定的字符子串的数量

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

#define MAX_SIZE 1024

int main()
{
    int i;
    int k = 0;
    int count = 0;
    int len1 = 0;
    int len2 = 0;

    char str1[MAX_SIZE];
    char str2[MAX_SIZE];

    printf("please input the string1:\n" );
    scanf("%s",str1);

    printf("please input the string2:\n");
    scanf("%s",str2);

    len1 = strlen(str1);
    len2 = strlen(str2);

    for(i = 0; i < len1; i++)
    {
        while(k < len2 && str1[i] == str2[k])
	{
	    k++;
	    i++;
	}

	if(k == len2)
       { 
           count++;
           
	   i--;
       }

        k = 0;

    }

    printf("the number is %d:\n",count);

    return 0;

}