/* C++ Programming, Example answer, Exercise 2, Sheet 4  */

/* Author: Rob Miller and William Knottenbelt
   Program last changed: 30th September 2023    */

/* This program prints a "pyramid" of a specified height on the screen */

#include <iostream>
using namespace std;

void print_pyramid(int height);
	
/* START OF MAIN PROGRAM */
int main() 
{
	int pyramid_height;
	
	cout << "This program prints a 'pyramid' shape of\n";
	cout << "a specified height on the screen.\n\n";

	/* input with check using a "while" loop */
	cout << "how high would you like the pyramid?: ";
	cin >> pyramid_height;
	while (pyramid_height > 30 || pyramid_height < 1)
	{
		cout << "Pick another height (must be between 1 and 30): ";
		cin >> pyramid_height;
	}
	/* input OK */
	
	print_pyramid(pyramid_height);
	
	return 0;
}
/* END OF MAIN PROGRAM */


/* FUNCTION TO PRINT PYRAMID */
void print_pyramid(int height)
{
	int line;
	int const MARGIN = 10;
	
	cout << "\n\n";
	
	for (line = 1 ; line <= height ; line++)
	{
		int count;
		int total_no_of_spaces = MARGIN + height - line;
		
		for (count = 1 ; count <= total_no_of_spaces ; count++)
			cout << ' ';
			
		for (count = 1 ; count <= line * 2 ; count++)
			cout << '*';
			
		cout << '\n'; 
	} 
	
	cout << "\n\n";
}
/*END OF FUNCTION */