Contoh Program Perulagan For C++

#include <iostream>

using namespace std;

int main()
{

int in;
      cout << "This program was created by Yudhi Desril Efendi" << endl;
      cout <<"Membuat Banyak Baris Angka"<<endl;
      cout <<"=========================="<<endl;
      cout << "Banyaknya Baris=";
      cin >> in;

      for (int i = 1; i <= in; ++ i) {
            for (int j = 1; j <= i * 2; ++j)
                  cout << i;

      }
    return 0;
}