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/*
 
 Name: Zach Hoggard
 Student No.: 250 611 551
 Email: zhoggard@uwo.ca
 Section: 004
 Date: February 8, 2012
 
 */

#include <iostream>
#include <cmath>

using namespace std;

int main ()

{
    //Declare variables
    double x, y;
    
    //Display the program discription
    cout << "This program calculates the value y = ( 4 - x * x ) ^ (1/2)\n";
    
    //Ask the user to input a value for x. If the value of x is not between -2 and 2, ask the user to input another value for x until the value is between -2 and 2.
    do {
        cout << "Please enter a value for x: "; cin >> x;
    } while (!(x >= -2 && x <= 2));
    
    //Solve the equation
    y = sqrt (4 - x * x);
    
    //Display the result for y
    cout << "The result for y = " << y;
    
    //Terminate the program
    return 0;
    
}