/* April21.cpp */
/* CS 10051 example code, showing while and for loop equivalence */
/* Also showing the modulus function checking for odd /even values */
/* S. Steinfadt - 4/21/08 */

#include <iostream>

using namespace std;

// Main function
int main()
{
/***************************************************************
	WHILE loop construction
***************************************************************/	

	int x;		// Variable declaration	
	x = 5;		// Loop control variable 

	cout << "While loop using x:\n"; 
	while (x >= 0)  // while conditon
	{
		cout << x << "\n";
		x--;  //x = x - 1;   // Updating loop control variable
	
	} 
	
/***************************************************************
	Equivalent FOR loop 
***************************************************************/	

	cout << "****************\n";
	cout << "For loop using y:\n";
	
	// Equivalent for loop -- does same thing as the while loop
	// for (loop_var; loop condition; loop_var update)
	for(int y = 5; y >=0; y--)
	{
		cout << y << "\n";
	}
	
/***************************************************************
	Use of MODULUS (%) Operator
***************************************************************/	

	cout << "Check for even / odd value\n";
	cout << "Please enter a number: ";
	cin >> x;
	
	
	// Modulus operator will return the WHOLE number that is
	// the remainder of an INT division
	int remainder = x % 2;
	if (remainder == 0)
		cout << "The number " << x << " is even.\n";
	else  // don't need an "else if" here since a number is only odd OR even
		cout << "The number " << x << " is odd.\n";
	
	return 0;
}