/*This program reads a string of numbers separated by spaces
  from picint.dat and displays the result visually.*/

#include<iostream>
#include<fstream>
#include<cstdlib>

class Printer
{
    public:
        Printer(char initial_character);
        void input(istream& input_stream);
        void check();
        void output();
    private:
        int number1, number2;
        char character;
};

int main ()
{
    //Initialization
    Printer pair('*');
    ifstream input_stream;
    input_stream.open("picint.dat");
    if (input_stream.fail())
    {
	cout << "Error opening picint.dat";
	exit(1);
    }
    //Main program
    while (1)
    {
	pair.input(input_stream);
	pair.check();
	pair.output();
    }
    //End of program
    input_stream.close();
    return 0;
}

Printer::Printer(char initial_character) : character(initial_character)
{}    

void Printer::input(istream& input_stream)
{
    input_stream >> number1 >> number2;
}

void Printer::check()
{
    if (number1 < -6 || number2 < 0)//Check for validity
    {
	cout << "\nThe pair (" << number1 << ", " << number2
	     << ") is not valid input.\n"
	     << "Maybe you should check Prof. Mozer's instructions\n"
	     << "to see examples of valid input.\n";
	exit(1);
    }
}

void Printer::output()
{
    switch (number1)
    {
        case -1://-1:End line
	    cout << endl;
	    break;
        case -2://-2:Exit
	    exit(1);
        case -3://-3:Change character
	    character = number2;
	    break;
        case -4://-4:Square
	    for (int counter1 = 0; counter1 < number2; counter1++)
	    {
		for (int counter2 = 0; counter2 < number2; counter2++)
		    cout << character;
		cout << endl;
	    }
	    break;
        case -5://-5:Upright triangle
	    for (int counter1 = 0; counter1 < number2; counter1++)
	    {
		for (int counter2 = 0; counter2 <= counter1; counter2++)
		    cout << character;
		cout << endl;
	    }
	    break;
        case -6://-6:Upside-down triangle
	    for (int counter1 = 0; counter1 < number2; counter1++)
	    {
		for (int counter2 = 1;
		     counter2 <= number2 - counter1; counter2++)
		    cout << character;
		cout << endl;
	    }
	    break;
        default://Characters and spaces
	    for (int counter1 = 0; counter1 < number1; counter1++)
		cout << character;
	    for (int counter1 = 0; counter1 < number2; counter1++)
		cout << " ";
    }
}