This program draws right triangles


#include <iostream>
using namespace std;

class triangle {
  int height, base;
public:
  triangle(int h, int b) { height = h; base = b; }
  friend ostream &operator<<(ostream &stream, triangle ob);
};

// Draw a triangle.
ostream &operator<<(ostream &stream, triangle ob)
{
  int i, j, h, k;

  i = j = ob.base-1;
  for(h=ob.height-1; h; h--) {
    for(k=i; k; k--) 
      stream << ' ';
    stream << '*';
    
    if(j!=i) {
      for(k=j-i-1; k; k--)
        stream << ' ';
      stream << '*';
    }

    i--;
    stream << '\n';
  }
  for(k=0; k<ob.base; k++) stream << '*';
  stream << '\n';

  return stream;
}

int main()
{
  triangle t1(5, 5), t2(10, 10), t3(12, 12);

  cout << t1;
  cout << endl << t2 << endl << t3;

  return 0;
}

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This program draws right triangles : Inserter « Overload « C++

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