#include <iostream>
using namespace std;
int main() {
    int score;
    cout << "请输入成绩：" << endl;
    cin >> score;
    cout << "你的成绩是：" << score << endl;
    return 0;
}

#include <iostream>
using namespace std;
int main() {
    int num;
    cout << "请输入数字：" << endl;
    cin << num;
    return 0;
}

#include <iostream>
int main() {
    cout << "Hello C++" << endl;
    return 0;
}

#include <iostream>
using namespace std;
int main() {
    int a = 10, b = 20;
    cout << a + b = << 30 << endl;
    return 0;
}