Program to find the area and circumference of a circle

[ We have learnt how to install the IDE and to do the programs already. If any doubts visit my first Program.]

                 TO FIND AREA AND CIRCUMFERENCE OF A CIRCLE

CODING:

#include<stdio.h>
main()
{
    float area, radius,circum;
    printf("\n");
    printf("Enter the radius: ");
    scanf("%f",&radius);
    circum = 2.0*22.0/7.0*radius;
    area = 22.0/7.0*radius*radius;
    printf("AREA AND CIRCUMFERENCE OF A CIRCLE");
    printf("\n*********************************");
    printf("\n\n");
    printf("The radius is %5.2f", radius);
    printf("\n\n");
    printf("The Area is %5.2f", area);
    printf("\n\n");
    printf("The Circumference is %5.2f", circum);
    printf("\n\n");
    getch();   
}

OUTPUT:

EXPLANATION:

   First, the variables has been declared as float type. we have to use scanf method to read the value and the data type has to be given as %f. Formula for area of a circle is
π×(radius)² and for circumference is 2 π×r.

  getch() is a function which has its protype defined in conio.h header file.
it is basically used to take input a single character from keyboard and this char is not displayed at the screen.
it waits until itn gets a input that's why it can be used as a screen stopper.