Membuat segitiga di C++

<code>
#include <iostream>

using namespace std;

int main()
{
    for (int a=0; a<8; a++){
        if (a==0){
            for (int b=0; b<=8; b++){
                cout<<b<<" ";
            }
        }
        else{
            cout<<a<<" ";
            for (int k=1; k<=a; k++){
                cout<<k*a<<" ";
            }
        }
        cout<<endl;
    }
    return 0;
}
</code>