C Program to Find the Area of a Circle Using Functions

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

Contents

C Program to Find the Area of a Circle Using Functions

Program:

#include<stdio.h>

float circleArea(float r);

int main()
{
  float radius, area;

  printf("Enter the radius of the circle: ");
  scanf("%f", &radius);

  area = circleArea(radius);
  printf("Area of circle = %.2f\n",area);

  return 0;
}

// function
float circleArea(float r)
{
  float area = 3.14 * r * r;
  return area;
}

Output:

Enter the radius of the circle: 5
Area of circle = 78.50

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