请问这个程序怎么去写

Question

输入一个整数，若达到3个7则输出good luck,否则输出包含数字7的个数

Answer 1

#include<stdio.h>
#include<string.h>
int main() {
    int n;
    scanf("%d",&n);
    int count = 0;
    while(n > 0){
        if(n % 10 == 7){
            count++;
        }
        n /= 10;
    }
    if(count == 3){
        printf("good luck");
    }else{
        printf("%d",count);
    }
    return 0;
}