c++ - 如何循环程序在 C++ 中请求新的输入集？

Question

考虑以下代码:

#include <iostream>
using namespace std;
int main(){
    int a,b;
    cout << "Enter two positive numbers:" <<endl;
    cin >> a >> b;
    if (a<b) cout <<a<<" is less than "<< b<<endl;
    else if (a>b) cout <<a<<" is greater than " <<b<<endl;
    }

如何让程序无休止地重复要求输入一组新数字？

Answer 1

这是执行所需操作的最简单方法(还有其他方法)。基本上，您只需将要在循环中重复的代码“包装”起来，其中循环的“测试”条件将始终评估为true。

注意我给出的带有“///”的注释:

#include <iostream>
//using namespace std; /// Search this site for "Why using namespace std is bad"
using std::cout;/// Just declare usage of those feature you ACTUALLY use...
using std::cin;
using std::endl;

int main() {
    int a, b;
    while (true) { /// The test condition will always be "TRUE" so the loop will never end!
        cout << "Enter two positive numbers:" << endl;
        cin >> a >> b;
        if (a < b) cout << a << " is less than " << b << endl;
        else if (a > b) cout << a << " is greater than " << b << endl;
    //  cout /// This line is wrong!
    }
}

随时要求进一步澄清和/或解释。