C Program to Calculate Area and Circumference of circle

C Program to find area and circumference of circle

#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);
}

#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);

}

Output :

Enter radius of a circle : 1
Area of circle : 3.14
Circumference  : 6.28

Enter radius of a circle : 1

Area of circle : 3.14

Circumference : 6.28

Explanation of Program :

In this program we have to calculate the area and circumference of the circle. We have following 2 formulas for finding circumference and area of circle.

Area of Circle = PI * R * R

1	Area of Circle = PI * R * R

and

Circumference of Circle = 2 * PI * R

1	Circumference of Circle = 2 * PI * R

In the above program we have declared the floating point variable PI whose value is defaulted to 3.14.We are accepting the radius from user.

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

1 2	printf("\nEnter radius of circle: "); scanf("%d", &rad);

Download C Program :

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