# C Program to calculate area and circumference of circle

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Write a program to calculate area and circumference of a circle where radius of a circle is imputed and define pi as constant.

Write a c program to calculate area and circumference of the circle.

## C Code

`#include<stdio.h>#include<conio.h>#define pi 3.14void main(){  int r;  float a, c;  printf("ntenter value of radius=");  scanf("%d",&r);  a= pi*r*r;  c=2*pi*r;  printf("tArea = %.2fn",a);  printf("tCircumference = %.2fn",c);  getch();}`

## Output

You can also perform this calculate by defining pi as float value.

## C Code

`#include<stdio.h>#include<conio.h>void main(){  int r;  float a, c;  float pi=3.14;  printf("ntenter value of radius=");  scanf("%d",&r);  a= pi*r*r;  c=2*pi*r;  printf("tArea = %.2fn",a);  printf("tCircumference = %.2fn",c);  getch();}`

## Output

You can also perform this calculation by putting value

## C Code

`#include<stdio.h>#include<conio.h>void main(){  int r;  float a, c;  printf("ntenter value of radius=");  scanf("%d",&r);  a= 3.14*r*r;  c=2*3.14*r;  printf("tArea = %.2fn",a);  printf("tCircumference = %.2fn",c);  getch();}`