#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);
}
Enter radius of a circle : 1
Area of circle : 3.14
Circumference : 6.28
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
And
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);