Write a program in C++ to display the pattern like right angle triangle with a number. ..

#include <iostream>
using namespace std;
void main()
{
int i,j,rows;
cout<<"input number of rows :";
cin>>rows;
for(i=1;i<=rows;i++)
{
for(j=1;j<=i;j++)
{
cout<<j;
}
cout<<endl;
}
    system ("pause");
}