gistfile1.txt

#include <iostream>
#include <limits>
#include <iomanip>

using std::cout;
using std::endl;
using std::cin;

int menu()
{
	double rec, square, circle, sum;
	char choice;
	cout << "\n Choose which Area you want to find:\n"
		<< "1) Area of rectangle.\n"
		<< "2) Area of Square.\n"
		<< "3) Area of Circle.\n"
		<< "Choose any of the above, or enter 4 to quit." << endl;
	cin >> choice;
	cin.ignore(std::numeric_limits<int>::max(), '\n');
	return choice;
}

void choice1()
{
	
	double l, b, areaofrectangle;

	cout << "enter lengeth of rectangle : ";
	cin >> l;
	cout << "enter breadth : ";
	cin >> b;

	areaofrectangle = l*b;

	cout << "Area of rectangle is : " << areaofrectangle << endl;
}

void choice2()
{
	double l, areaofsquare;
	cout << " enter length is square : ";
	cin >> l;
	areaofsquare = l*l;
	cout << "Area of square is : " << areaofsquare << endl;
}

void choice3()
{
	double r, areaofcircle;
	const double pi = 3.14159;
	cout << "enter radius of circle : ";
	cin >> r;
	areaofcircle = pi*r*r;
	cout << "area of circle is : " << areaofcircle;
}

int main()
{
	char choice;
	do
	{
		choice = menu();
		switch (choice)
		{
		case '1':
			choice1();
			break;
		case '2':
			choice2();
			break;
		case '3':
			choice3();
			break;
		case '4':
			break;
		default:
			cout << "Try entering a number that's\
					                actually on the screen." << endl;
			break;
		}
	} while (choice != '4');
	return 0;
}