Function Help

[illlojik]

Hello, I'm having a little problem with my program. The user prints a number, and the value of that number is the number of times the loop will iterate. Basically its a coin toss program, 1 for heads and 2 for tails. The number is random and should display heads OR tails the number of times we tossed the coin.

This is what I did:

#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;

void cointoss();

int main()
{
	int num;   //number of times the coin is tossed

	cout << " How many times will we toss the coin? ";
	cin >> num;
	cout << "\n 1 for heads, 2 for tails. " << endl;

	for(int count = 1; count <= num; count++)
	{
		cointoss();
	}
	
	return 0;
}

void cointoss()
{
	unsigned seed = time(0);
	srand(seed);

	if(1 + rand() % 2 == 1)
	{
		cout << " Heads " << endl;
	}
	else if(1 + rand() % 2 == 2)
	{
		cout << " Its tails " << endl;
	}
}

[illlojik]

if I enter 20 for the number of times I toss the coin, I would get either 20 heads, or 20 tails.

[carebearboy]

Move this line:

unsigned seed = time(0);
srand(seed);

.. to line 11.

The seed only needs to be initialized once.


* edit *

and you can shorten your randomizer from the above line to:

srand(time(0));

Same thing.

[whitenite1]

@illlojik
You don't really need line 14, since you are printing 'Heads' and 'Tails', not 1 or 2. Anyway, I fixed the program to do what you wanted, except I made the random a 0 or 1, and I kept track of what the results were to print it afterward. Remove the Sleep(800) if you don't want the pausing between tosses. Here's the program.

// Coin Toss.cpp : main project file.

#include "stdafx.h"
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <windows.h>

using namespace std;

int cointoss();

int main()
{
	srand(GetTickCount());
	int num = 0;     //number of times the coin is tossed
	int quarter = 0; //the coin being tossed
	int heads = 0;   //number of times coin is heads
	int tails = 0;   //number of times coin is tails

	cout << "How many times will we toss the coin? ";
	cin >> num;
	for(int count = 1; count <= num; count++)
	{
		cout << "On toss " << count << " the coin turned up";
		quarter = cointoss();
		if (quarter)
			tails++;
		else
			heads++;
		Sleep(800);
	}
	cout << endl << "After " << num << " tosses, heads came up " << heads << " times and tails, " << tails << "..." << endl;
	return 0;
}

int cointoss()
{
		
	int coin = (rand() % 2 );
	if ( coin == 0)
	{
		cout << " Heads." << endl;
		return coin;
	}
	if (coin == 1)
	{
		cout << " Tails." << endl;
		return coin;
	}
	return - 1;
}