In our earlier post we calculated the area and perimeter of a circle.In this post we are dealing with calculating the area and perimeter of a circle.

The main input for calculating area and perimeter of a circle is radius of the circle.We use the datatype float to store the radius of the circle.The formula to find the area of the circle is 3.14*r*r and the formula to find perimeter of the circle is 2*3.14*radius.After calculating the area and perimeter we need to display the results to the user.

#include<stdio.h>
#include<conio.h>
void main()
{
  float radius,area,perimeter;  //variable to store radius,area and perimeter
  clrscr();
  printf("\nEnter the radius of the circle:");
  scanf("%f",&radius);
  area = 3.14*radius*radius;
  perimeter = 2*3.14*radius;
  printf("\nArea of the given cirlce is:%f",area);
  printf("\n\nPerimeter of the given circle is:%f",perimeter);
  getch();
}

OUTPUT:

You can download the program:download
If you have any doubts you can place them in comments.