C++循环读取用户输入方法

#include <iostream>
using namespace std;

int main() {
    int num;
    cout << "请输入数字（输入0结束）：" << endl;
    while (cin >> num) {
        if (num == 0) break;
        cout << "你输入了：" << num << endl;
    }
    cout << "程序结束。" << endl;
    return 0;
}

#include <iostream>
using namespace std;

int main() {
    int num;
    for (int i = 0; i < 5; ++i) {
        cout << "第" << i+1 << "个数字：";
        cin >> num;
        if (num == -1) {
            cout << "提前退出。" << endl;
            break;
        }
        cout << "已记录：" << num << endl;
    }
    return 0;
}

#include <iostream>
#include <string>
using namespace std;

int main() {
    string name;
    cout << "请输入姓名（输入done结束）：" << endl;
    while (getline(cin, name)) {
        if (name == "done") break;
        cout << "你好，" << name << "！" << endl;
    }
    return 0;
}

while (true) {
    cout << "请输入一个整数：";
    if (cin >> num) {
        cout << "输入有效：" << num << endl;
    } else {
        cout << "输入无效，程序退出。" << endl;
        cin.clear();                // 清除错误标志
        cin.ignore(10000, '\n');   // 忽略错误输入
        break;
    }
}