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C Program to Find Area of Circle

Last Updated : 14 Jul, 2023
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The area of a circle is the region enclosed by the circle's boundary. In this article, we will learn the program to find the area of a circle in C programming.

The area of a circle can simply be evaluated using the formula:

Area = Pi * r2

where r is the radius of the circle and the value of Pi is 3.14159265358.

Algorithm to Find Area of Circle in C

  • Define a constant PI with the value of 3.142.
  • Create a function findArea.
  • Within the findArea function, Multiply PI by the square of the radius r and return the result.

Area of Circle Program in C

C 
// C program to find the area of
// the circle using radius
#include <math.h>
#include <stdio.h>
#define PI 3.142

// Function to find the area of
// of the circle
double findArea(int r) { return PI * r * r; }

// Driver code
int main()
{
    printf("Area is %f", findArea(5));
    return 0;
}

Output
Area is 78.550000

Complexity Analysis

Time Complexity: O(1)

Auxiliary Space: O(1)

Please refer complete article on Program to find the area of a circle for more details.


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