C Program to find Area of Circle Using Pointer

Learn about C Program to find Area of Circle Using Pointer in the below code example. Also refer the comments in the code snippet to get a detailed view about what’s actually happening.

C Program to find Area of Circle Using Pointer

According to the formula , Area of circle is equal to pi multiplied by square of radius. Hence, we assign value of radius to pointer pr, so we can calculate the area and assign to pointer parea.

#include<stdio.h>
#define PI 3.14
int main()
{
  double r, area;
  double *pr, *parea;
  pr= &r, parea=&area;//assigning varaibles to pointers
  printf("Enter radius: ");
  scanf("%lf",pr);
  *parea = PI*(*pr)*(*pr);//calculating area 
  printf("Area of radius %.3lf = %.3lf\n", *pr, *parea);
  return 0;
}

Output:

Enter radius: 21
Area of radius 21.000 = 1384.740

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