Answer 1

#include <iostream>
using namespace std;

int main() {
int i,j;
for(i=0; i<3; i++){
for(j=0; j<=i; j++)
cout<<"for outer loop's' i : "<<i<< ", inner loop's' j = "<<j<<endl;
cout<<endl;
}
return 0;
}

//run this code, it explains what happening there...