//File patterns.cpp
//Author:  Carol Conway  3/27/18
//This program illustrates the use of loops to print various patterns
#include <iostream>
using namespace std;

int main()
{
  int rows;     //number of rows desired in the pattern
  cout << "How many rows would you like to display? \n";
  cout << "You may enter a number from 1 to 25 ";
  cin >> rows;
  while (rows < 3 || rows > 25)
  {
      cout << "Rows must be from 3 to 25.  Try again! ";
      cin >> rows;
  }

  cout << "This is a square pattern\n";
  for (int j = 1; j <= rows; j++)
  {
     for (int k = 1; k <= rows; k++)
     {
        cout << "*";
     }
     cout << "\n";         //end of a row
  }
  cout << "This is a triangle pattern\n";
  for (int j = 1; j <= rows; j++)
  {
     for (int k = 1; k <= j; k++)
     {
        cout << "*";
     }
     cout << "\n";         //end of a row
  }
  cout << "This is an indented right triangle pattern\n";
  //It only works it the number of rows is odd
  if (rows %2 == 0)
    rows++;
  for (int j = 1; j <= rows; j++)
  {
  //writes the spaces
     for (int i = rows -j; i > 0; i-- )
       cout << " ";

  //writes the stars
     for (int k = 1; k <= j; k++)
        cout << "*";
     cout << "\n";         //end of a row
  }

  cout << "This is an indented triangle pattern\n";
  //It only works it the number of rows is odd
  if (rows %2 == 0)
    rows++;
  for (int j = 1; j <= rows; j++)
  {
  //writes the spaces
     for (int i = rows -j; i > 0; i-- )
       cout << " ";

  //write the stars
     for (int k = 1; k <= 2*j-1; k++)
        cout << "*";
     cout << "\n";         //end of a row
  }
  return 1;
}