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C Program to Find Circle's Area and Circumference
This tutorial will provide the source code of C Program to find the area and circumference of a circle provided we know the diameter or radius of a circle. If we are given Diameter of a circle, then we need to divide it by 2 so that we get the value of radius of circle as most of the calculations we do require radius.
The Formula for calculation of Area of Circle is :
Area of Circle = PI * R * R
While Formula for calculation of Circumference of Circle is :
Circumference of Circle = 2 * PI * R
We have already defined Pi as Floating type variable whose value is fixed as 3.14 for the calculation purposes.
C Program Source Code to Find Area and Circumference of a Circle
#include<stdio.h>
int main()
{
int radius;
float PI=3.14,area,cirf;
printf("nEnter the radius of circle: ");
scanf("%d",&radius);
area = PI * radius * radius;
printf("nArea of circle : %f ",area);
cirf = 2 * PI * radius;
printf("nCircumference : %f ",cirf);
return(0);
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Output of Program :
Enter radius of a circle : 1 Area of circle : 3.14 Circumference : 6.28
Poll Time :
What will be the area of circle of radius = 5.5 ?
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