Triangle output

[tomtom61695]

I am trying to create a function that outputs a triangle. I have this one below that creates a square and need something similar that creates a triangle. Any help would be much appreciated. I can't seem to figure it out.

  void draw_square(char &character, int &start_size, int &end_size){
    
    int size = start_size;
    while(start_size != end_size + 1){
        for (int row = 1; row <= size; row++){
            for (int col = 1; col <= size; col++){
                if (row > 1 && row < size && col > 1 && col < size){
                    cout << " ";
                }
                else{
                    cout << character;
                }
            }
            cout << endl;
        }
        size++;
        start_size++;
    }
}