C program to find the area and circumference of the circle

Aim:

To write a C program to find the area and circumference of the circle.

Algorithm:

Step1: Start the program

Step2: Declare the variables r, area and circumference

Step3: Read the radius of the circle

Step4: Find the area and circumference of the circle using the formula

Area = 3.14*r*r

Circumference= 2*3.14*r

Step5: print the area and circumference of the circle

Step6: Stop

Program:

#include<stdio.h>

int main() {

   int rad;
   float PI = 3.14, area, ci;

   printf("\nEnter radius of circle: ");
   scanf("%d", &rad);

   area = PI * rad * rad;
   printf("\nArea of circle : %f ", area);

   ci = 2 * PI * rad;
   printf("\nCircumference : %f ", ci);

   return (0);
}