#include <iostream>
using namespace std;

int main() {
    int n=4;

    int num=1;

    for(int i=0;i<n;i++){
        for(int j=0;j<n;j++){
            cout<< num <<" ";
            num++;
        }

        cout<<endl;
    }
    
    return 0;
}

Embed on website

To embed this program on your website, copy the following code and paste it into your website's HTML: