Needs help in logic

Hi guys: Can any one please help me how to i print the * in that order that first it print one then two and then three. I try it first but made mistakes as its printing three in each row

Output required
*
**
***

#include <iostream>
using namespace std;

int main()
{
      for (int row = 1; row < 4; row +=1)
      {
            for(int asterisks = 1; asterisks <= 3; asterisks +=1)
                  cout << '*';
      cout << endl;
      }
      system("pause");
      return 0;
}