Area of a Circle

In the Mini project, 3rd function is to find the area of a circle. Rita allotted this function to Suganya.

Help Suganya to write a program to find the area of a circle using functions.

Function Specification:

float calcarea(float x);

Input Format:

Input consists of 1 floating point number which corresponds to the radius of the circle.

Output Format:

The output consists of a single floating point number (correct to 2 decimal places). 

Take the value of pi as 3.14.

Refer sample input and output for formatting details.

Sample Input:

3

Sample Output:

The area of the circle is 28.26

Program Code:

#include <stdio.h>

const float PI = 3.14;

float calcarea(float radius);

int main()

{

float radius;

scanf("%f", &radius);

printf("The area of the circle is %.2f", calcarea(radius));

return 0;

}

/* return area of a circle */

float calcarea(float radius)

{

return PI * radius * radius;

}