C++两数求和

#include <iostream>
using namespace std;

int main() {
    
    int a,b;
    cin >> a;  // 注意cin和cout的箭头方向
    cin >> b;
    int sum = a + b;
    cout << sum << endl;

    return 0;
}

#include <iostream>
using namespace std;

int main() {

    int a,b;
    cin >> a >> b;
    cout << a + b << endl;
    
    return 0;
}