PTA 统计各位数字之和是5的数

#include 

int is( int number );
void count_sum( int a, int b );

int main()
{
    int a, b;

    scanf("%d %d", &a, &b);
    if (is(a)) printf("%d is counted.\n", a);
    if (is(b)) printf("%d is counted.\n", b);
    count_sum(a, b);
    return 0;
}
//1234%10 = 4,123%10 = 3,12%10 = 2
// %10 可以取到数字最后一位
// /10 可以取到数字的前几位
int is(int number){
    int sum = 0,t = 0;
    while (number != 0)
    {
        t = number%10;
        sum += t;
        number /= 10;
    }
    if(sum == 5){
        return 1;
    }
    return 0;
}

void count_sum( int a, int b ){
    int count=0,sum=0;
    for(int i=a;i <= b;i++){
        if(is(i) != 0){
            count += 1;
            sum += i;
        }
    }
    printf("count = %d, sum = %d",count,sum);
}