# 6+ C Programs to Calculate Area of a Circle

This post contains a total of 6+ C Program Examples with Source Code to Calculate the Area of a Circle. All these Circle Area Calculator programs are made using C Language.

You can use the source code of these examples with credits to the original owner.

## C PROGRAMS TO CALCULATE AREA OF CIRCLE

Made by Sadhvik Morla. Simple Program to find the Area of a circle. Source

```10
area of circle of radius 10 = 314.159210```
``````#include <stdio.h>
int main()
{
int r;
float area;
scanf("%d",&r);
area=3.141592*r*r;
printf("area of circle of radius %d = %f",r,area);
}``````

### 2. By Junior Rido

```33
The area of circle is 3419.460205```
``````#include <stdio.h>
int main() {

int redius = 33 ;

float π = 3.14;

printf ("The area of circle is %f", π*redius*redius);

return 0;
}``````

### 3. By Sriram Kummari

Made by Sriram Kummari. Basic C Program to Calculate the Area of a Circle. Source

```Enter Radius: 40
Area : 5024.00```
``````#include<stdio.h>
int main()
{
printf("Area : %6.2f",area);
return (0);
}``````

### 4. By Gaurav Gunwant

`314.000000`
``````#include <stdio.h>

int main() {
int r;
float pi,area;
r=10;
pi=3.14;
area=pi*r*r;
printf("%f",area);
return 0;
}``````

### 5. By Monalisa

Made by Monalisa. This C program calculates the area and the perimeter of a circle. Source

```enter the radius 33
area=13068 and perimeter=198```
``````#include <stdio.h>

int area (int);
int cir (int);
extern int pi = 3.141;
int main()
{
int r,ar,cr;
scanf("%d",&r);
ar=area(r);
cr=cir(r);
printf ("area=%d and perimeter=%d",ar,cr);
return 0;
}
int area(int r)
{
int a;
a=4*pi*r*r;
return a;
}
int cir (int r)
{
int p;
p=2*pi*r;
return p;
}``````

### 6. By partha dutta

Made by partha dutta. Program to find area of a circle and triangle using Function. Source

```12
452.160004```
``````#include <stdio.h>
#define PI 3.14
int main() {
float r,b,h;
void circle(float *x);
void triangle(float *y,float *z);
scanf("%f",&r);
scanf("%f%f",&b,&h);
circle(&r);
triangle(&b,&h);
return 0;
}
void circle(float *x)
{
float area1;
area1=PI*(*x)*(*x);
printf("%f\n",area1);
}
void triangle(float *y,float *z)
{
float area2;
area2=(*y/2)*(*z/2);
printf("%f\n",area2);
}``````

### 7. By Sukanya

Made by Sukanya. Program to find area of circle and rectangle. Source

```Enter c for circle or r for rectangle
c
10
The area is 314.000000 ,the circumference is 62.799999```
``````#include <stdio.h>
int main() {
char c,r,a;
float area, circumference,perimeter;
printf("Enter c for circle or r for rectangle\n");
scanf("%c",&a);
if(a=='c')
{