你可以在C++中嵌入循环

#include<iostream>
using namespace std;

int main() {
    for (int i = 0; i < 3; i++) {
        for (int j = 0; j < 3; j++) {
            cout << "(" << i << ", " << j << ")"<< endl;
        }
    }
    return 0;
}

#include<iostream>
using namespace std;

int main() {
    int i = 0;
    while (i < 3) {
        int j = 0;
        while (j < 3) {
            cout << "(" << i << ", " << j << ")"<< endl;
            j++;
        }
        i++;
    }
    return 0;
}