/*This is a program to calculate area of a circle after getting the radius as input from the user*/
#include<stdio.h>
int main()
{
double radius,area;//variables for storing radius and area
printf("Enter the radius of the circle whose area is to be calculated\n");
scanf("%lf",&radius);//entering the value for radius of the circle as float data type
area=(22.0/7.0)*pow(radius,2);//Mathematical function pow is used to calculate square of radius
printf("The area of the circle is %lf",area);//displaying the results
getch();
}
/*A test run for the program was carried out and following output was observed
Enter the radius of the circle whose area is to be calculated
5.00
The area of the circle is 78.571429*/