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Program to Calculate Area of Circle

Write a program to calculate area of a circle.  To calculate the area of a circle use the Mathematical formula define below.

Area of Circle is :   π × r2

Where r is the radius of the circle and the value of PI is 3.14 (22/7).

Let's say someone input the value of radius of circle (r) is 3.

Area of circle is : 3.14 * 3 * 3
:28.27

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Program to Calculate Area of Circle

```#include <stdio.h>
int main()
{

/* Declare PI and area as float datatype. */

float PI=3.14,area;

/* Take radius of a circle as a input from user. */

printf("\n Enter radius of a circle: ");

/* Area of circle */

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

return(0);
}

```
Output:

Enter radius of a circle: 3

Area of circle is : 28.260001