题解 | 数位五五

#include <stdio.h>
int sum(int a,int b)
{   
    int count = 0;
    //求出一个数的每一位
    for(int i = a; i <= b; i++)
    {
        int tmp = i;//存值
        int s = 0;
        while(tmp)
        {
            s+=tmp%10;
            tmp/=10;
        }
        if(s%5 == 0)
        {
            count++;
        }
    }
    return count;
}
int main() {
    int a,b;
    scanf("%d %d",&a,&b);
    int num = sum(a,b);
    printf("%d",num);
    return 0;
}