C Program to Calculate Area of Circle

C Program for Beginners : Area of Circle

Shape : Circle
Formula : Π * r * r

Definition :

Ellipse in which the two axes are of equal length
Plane curve generated by one point moving at a constant distance from a fixed point
You can compute the area of a Circle if you know its radius.

Program :

#include<stdio.h>
int main() {
   float radius, area;
   printf("\nEnter the radius of Circle : ");
   scanf("%d", &radius);
   area = 3.14 * radius * radius;
   printf("\nArea of Circle : %f", area);
   return (0);
}

#include<stdio.h>

int main() {

float radius, area;

printf("\nEnter the radius of Circle : ");

scanf("%d", &radius);

area = 3.14 * radius * radius;

printf("\nArea of Circle : %f", area);

return (0);

}

Output :

Enter the radius of Circle : 2.0
Area of Circle : 6.14

1 2	Enter the radius of Circle : 2.0 Area of Circle : 6.14

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C Program to Calculate Area of Circle