# 11 : C Program to Calculate Area of ellipse

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To calculate the area of ellipse you need to know the radius 1 and radius 2 of the eclipse.

Variables :

1. r1 : (Datatype int) : to represent the radius 1 of ellipse.

2. r2 : (Datatype int) : to represent the radius 2 of ellipse.

3. PI : (Datatype float) : static variable to represent constant PI value upto 3 decimal places i.e 3.142

5. area_of_ellipse : (Datatype long) : to store area of ellipse calculated.

Functions :

printf() : is used to display something on the console/screen. Format specifier %d in printf function is used to display a int variable on screen and %ld for long. \n is used to add a newline

scanf() : is used to fetch data inputted by the user on the console/screen using keyboard. %d in scanf is indicates that inputted text is of type int and %ld for long.

Formula :

Volume of Ellipse : π x r1 x r2

``````
/*
* 1000+ C programs + tutorials
*
*
* 11_calculate_area_of_ellipse.c
*
*
*  Created on: Oct 20, 2014
*  Author: Code2care.org
*/

#include <stdio.h>
//#include <conio.h>

void main() {

int r1,r2;
float PI = 3.142;
long area_of_ellipse;

//	clrscr();

printf(" Program to calculate Area of a Ellipse :  \n\n");

printf(" Enter Radius1 of Ellipse : ");
scanf("%d", &r1);

printf("\n\n Enter Radius2 of Ellipse : ");
scanf("%d", &r2);

area_of_ellipse = PI*r1*r2;

printf("\n\n Area of Ellipse with radius1 as %d and radius2 as %d = %ld",r1,r2,area_of_ellipse);

//	getch();

}```
```

• Output :

Program to calculate Area of a Ellipse :

Enter Radius1 of Ellipse : 40

Enter Radius2 of Ellipse : 50

Area of Ellipse with radius1 as 40 and radius2 as 50 = 6284

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