Write a C program to output the area of a rectangle circle

Write a C ++ program to output the area of a rectangle, circle, and triangle. Ask the user which is desired, ask the parameters needed to compute the results. Allow the user to continue inputting requests until he/she tells the program to stop.

Solution

// C++ code

#include <iostream>
#include <fstream>
#include <string>
#include <cassert>
#include <iomanip> // std::setprecision
#include <math.h>

using namespace std;

# define M_PI 3.14159265358979323846 /* pi */

int main ()
{
   char shape;
   char again;
   double radius, length, breadth, base, height;

   while(true)
   {
       cout << \"What shape Would you like the area for? (r-rectangle; t-traingle; c-circle) \";
       cin >> shape;

       if(shape == \'r\')
       {
           cout << \"What is the length of your rectangle? \";
           cin >> length;
           cout << \"What is the breadth of your rectangle? \";
           cin >> breadth;

           cout << \"The area of your rectangle is \" << (length*breadth) << \" square units\ \";
       }

       else if(shape == \'t\')
       {
           cout << \"What is the base of your traingle? \";
           cin >> base;
           cout << \"What is the height of your traingle? \";
           cin >> height;

           cout << \"The area of your traingle is \" << (0.5*base*height) << \" square units\ \";
       }

       else if(shape == \'c\')
       {
           cout << \"What is the radius of your circle? \";
           cin >> radius;

           cout << \"The area of your circle is \" << (M_PI*radius*radius) << \" square units\ \";
       }

       else
       {
           cout << \"Invalid input\ \";
       }
       cout << \"\ Would you like t input another shape(y or n) \";
       cin >> again;

       if(again == \'n\')
           break;
   }
return 0;
}

/*
output:

What shape Would you like the area for? (r-rectangle; t-traingle; c-circle) t
What is the base of your traingle? 12
What is the height of your traingle? 7
The area of your traingle is 42 square units

Would you like t input another shape(y or n) y
What shape Would you like the area for? (r-rectangle; t-traingle; c-circle) c
What is the radius of your circle? 5.5
The area of your circle is 95.0332 square units

Would you like t input another shape(y or n) y
What shape Would you like the area for? (r-rectangle; t-traingle; c-circle) r
What is the length of your rectangle? 3
What is the breadth of your rectangle? 4
The area of your rectangle is 12 square units

Would you like t input another shape(y or n) n

*/