CircleClass.h
CircleClassDemo.cpp
CircleClass.h
#ifndef CIRCLE_H
#define CIRCLE_H
#include <cmath>
class Circle
{
private:
double radius; // Radius of the circle
double pi;
public:
Circle()
{
radius = 0.0;
pi = 3.14159;
}
// Sets the radius of the circle
void setRadius(double r)
{
radius = r;
}
// Gets the radius of the circle
double getRadius() const
{ return radius; }
// Calculates the area of the circle
double getArea() const
{ return pi * pow(radius, 2.0); }
// Calculates the circle's diameter
double getDiameter() const
{ return radius * 2.0; }
// Calculates the circle's circumference
double getCircumference() const
{ return 2.0 * (pi * radius); }
};
#endif
CircleClassDemo.cpp
/* CircleClass.cpp - Circle Class demo. */
#include <iomanip>
#include <iostream>
#include <string>
#include "CircleClass.h"
#include "UtilityCls.h"
using std::cin;
using std::cout;
using std::fixed;
using std::showpoint;
using std::setprecision;
using std::setw;
void displayInstructions();
void displayMenu();
void getRadius(Circle &);
void menu(Circle &);
int main()
{
Circle uCircle;
menu(uCircle);
cin.get();
cin.ignore();
return 0;
}
/* **********************************************************
displayMenu (void)
This function displays the menu options.
********************************************************** */
void displayMenu()
{
cout << "\nCIRCLE CALCULATOR\n\n"
<< "V] VIEW INSTRUCTIONS\n"
<< "E] ENTER RADIUS OF CIRCLE\n"
<< "A] CALCULATE AREA\n"
<< "D] CALCULATE DIAMETER\n"
<< "C] CALCULATE CIRCUMFERENCE\n"
<< "F] CALCULATE AREA / DIAMETER / CIRCUMFERENCE\n"
<< "Q] QUIT\n\n"
<< "Choice: ";
}
/* **********************************************************
displayInstructions (void)
This function displays the program instructions.
********************************************************** */
void displayInstructions()
{
cout << "WELCOME TO THE CIRCLE CALCULATOR.\n\n"
<< "To begin using with this program, select E] from the main menu to enter the radius\n"
<< "of your circle. Once done, you are able to select between the following menu items:\n\n"
<< "A] To calculate the area of your circle (formula: PI * radius * radius)\n"
<< "D] To calculate the diameter of your circle (formula: radius * 2.0)\n"
<< "C] To calculate the circumference of your circle (formula: 2.0 * PI * radius)\n\n"
<< "F] To calculate the area, diameter and circumference of your circle\n\n";
cout << "While in main menu, you are able to change the radius of the circle at any time,\n"
<< "then perform one calculation [A, D, C] or [F] for all calculations.\n"
<< "To quit this program you should enter 'Q' or 'q'\n\n";
}
/* **********************************************************
menu (accepts a reference to a Circle object)
This function holds the main menu of the program.
********************************************************** */
void menu(Circle &uCircle)
{
char choice = ' ';
do
{
displayMenu();
cin >> choice;
cout << "\n";
switch (choice)
{
case 'V':
case 'v':
{
displayInstructions();
pauseSytem();
clearScreen();
} break;
case 'E':
case 'e':
{
getRadius(uCircle);
pauseSytem();
clearScreen();
} break;
case 'A':
case 'a':
{
cout << setw(16) << "The radius of your circle is: "
<< setw(14) << uCircle.getRadius() << setw(5) << " feet.\n";
cout << setw(20) << "The area of your circle is "
<< setw(19) << uCircle.getArea() << " square feet.\n";
pauseSytem();
clearScreen();
} break;
case 'D':
case 'd':
{
cout << setw(16) << "The radius of your circle is: "
<< setw(14) << uCircle.getRadius() << setw(5) << " feet.\n";
cout << setw(20) << "The Diameter of your circle is: "
<< setw(11) << uCircle.getDiameter() << setw(4) << " feet.\n";
pauseSytem();
clearScreen();
} break;
case 'C':
case 'c':
{
cout << setw(16) << "The radius of your circle is: "
<< setw(14) << uCircle.getRadius() << setw(5) << " feet.\n";
cout << setw(20) << "The Circumference of your circle is "
<< setw(10) << uCircle.getCircumference() << " feet.\n";
pauseSytem();
clearScreen();
} break;
case 'F':
case 'f':
{
cout << setw(16) << "The radius of your circle is: "
<< setw(14) << uCircle.getRadius() << setw(5) << " feet.\n";
cout << setw(20) << "The area of your circle is "
<< setw(19) << uCircle.getArea() << " square feet.\n"
<< setw(20) << "The Diameter of your circle is "
<< setw(12) << uCircle.getDiameter() << setw(10) << " feet.\n"
<< setw(20) << "The Circumference of your circle is "
<< setw(10) << uCircle.getCircumference() << " feet.\n";
pauseSytem();
clearScreen();
} break;
case 'Q':
case 'q':
{
cout << "Thank you for trying this program! Have a nice day!";
}
}
} while (toupper(choice) != 'Q');
}
/* **********************************************************
getRadius (accepts a reference to a Circle object)
The user is asked to enter the radius of a circle. If the
radius is lower than or equal to 0, the user is asked to
repeat the input. Else, the value is passed to the member
variable of the circle object.
********************************************************** */
void getRadius(Circle &uCircle)
{
double radius = 0.0;
cout << "Enter the radius of a circle: ";
cin >> radius;
while (radius <= 0.0)
{
cout << "Enter radius greater than 0: ";
cin >> radius;
}
uCircle.setRadius(radius);
}
Example Output:
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