c++ - 运行 while 的第一个实例

Question

作业:

Write a program that loops indefinitely. In each iteration of the loop, read in an integer N (declared as an int) that is entered by a user, display N/5 if N is non-negative and divisible by 5, or -1 otherwise. Use the ternary operator (?:) to accomplish this. (Hint: the modulus operator may be useful.)

我的解决方案:

#include<iostream>
using namespace std;
int main(){
     int x;
     cin>>x;
     while(1) {
         cin>>x;
         int result;
         cout<<"             "<<endl;
         result = (x>0 & (x%5==0)) ? int(x/5) : -1;
         cout<<result;
     }
}

我可以做题但是程序的第一次运行没有给出输出

Answer 1

逐行检查程序。使用 cin>>x，您可以将一个数字读入 x。第 6 行是一个 while (1)，1 为真，所以你进入了循环。接下来的 cin>>x 将一个数字读入 x，覆盖之前的内容。