C Program to find out the area of a circle

C Program to find out the area of a circle

This is a C program to find out area of a circle. It will be useful to the beginners of C programming. In this example, it takes the radius of the circle as input to the program, calculates the area using the formula PI * r * r and prints the result.

See the source code of the program

/*

            Program to find out the area of a circle

            input  : raduis

            output : area

*/

# include <stdio.h>

# define PI 3.14

void main () {

            float r, area;

            clrscr();

            printf ("\nInput\n\n");

            printf ("Enter radius of the circle:");

            scanf ("%f", &r);

            area = PI * r * r;

            printf ("\nOutput\n\n");

            printf("Area of the circle is:%.2f", area);

            printf("\n\nPress any key to continue...");

            getch();

}  

Output