## Saturday, June 22, 2013

### Geometric Calculator

#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;

//declare constants.
const double PI = 3.14159;

int main()

{

int userChoice;
double circleRadius, areaCircle, rectangleLenght, width, rectangleArea, triangleBase, triangleHeight, triangleArea;

// Display the menu and allow user to choose 1-4.
cout << "\t\tGeometry Calculator"<<'\n';
cout << "\t1. Calculate the Area of a Circle"<<'\n';
cout << "\t2. Calculate the Area of a Rectangle"<<'\n';
cout << "\t3. Calculate the Area of a Triangle"<<'\n';
cout << "\t4. Quit\n\n";
cout << "\tEnter your choice (1-4): ";

cin >> userChoice;
//format output precision.
cout << fixed << showpoint << setprecision(2);

if (userChoice < 1 || userChoice > 4)
{
cout << endl;
cout << "\t\t**Error!!!"<<'\n';
cout<< "\tMenu option must be 1, 2, 3, or 4.\n\n";
}

// Respond to user's menu userChoice.
switch (userChoice)
{
case 1: // Find area of a circle
cout << endl;
cout << "\t\tArea of a Circle\n\n";
{
cout << '\n'<<endl;
cout << "\t\t!!! Invalid Input Data"<<'\n'<<endl;
cout<<"The radius of the circle must be a positive number and different from 0"<<'\n'<<endl;
}
else
{
areaCircle = PI * pow(circleRadius, 2.0);
cout << "\tArea = " << areaCircle << endl;
}
break;

case 2: // Find area of a rectangle
//format output precision.
cout << fixed << showpoint << setprecision(2);
cout << endl;
cout << "\t\tArea of a Rectangle\n\n";
cout << "\tPlease enter the length of the rectangle: ";
cin >> rectangleLenght;
cout << "\tPlease enter the width of the rectangle: ";
cin >> width;
if (rectangleLenght <= 0 || width <= 0)
{
cout << '\n'<<endl;
cout << "\t\t!!! Invalid Input Data"<<'\n'<<endl;
cout<<"The Length and Width must be a positive number and different from 0"<<'\n'<<endl;
}
else
{
rectangleArea = rectangleLenght * width;
cout << "\tArea = " << rectangleArea << " square units"<<endl;
}
break;

case 3: // Find area of a triangle
//format output precision.
cout << fixed << showpoint << setprecision(2);
cout << endl;
cout << "\t\tArea of a Triangle\n\n";
cout << "\tPlease enter the base of the triangle: ";
cin >> triangleBase;
cout << "\tPlease enter the height of the triangle: ";
cin >> triangleHeight;
if (triangleBase <= 0 || triangleHeight <= 0)
{
cout << '\n'<<endl;
cout << "\t\t!!! Invalid Input Data"<<'\n'<<endl;
cout<<"The Base and Height must be a positive number and different from 0"<<'\n'<<endl;

}
else
{
triangleArea = triangleBase * triangleHeight * 0.5;
cout << "\tArea = " << triangleArea << endl;
}
break;

case 4: // Quit the program
cout << "\n\n\tThank you for using this software. ";
cout<<endl;
}

system("pause");
return 0;
}