C program to find the area of a circle

C program to find the area of a circle

In this program, we are going to discuss how to calculate the area of a circle in c. so let’s start!

Example –

Input –

So first step we are going to take input from the user so we take the radius as 12.

Logic-

To calculate the area of the circle you must know the formula to calculate the area of the circle that is :

Area = 3.14 * r * r;

Output-

Enter the radius of the circle:22
The area of a circle is 1519.760010

Method 1:

So let us start to implement this formula in our program.

#include<stdio.h>
int main()
{
int radius;
float area;
printf(“Enter the radius of the circle: “);
scanf(“%d”, &radius);
area = 3.14 * radius * radius;
printf(“The radius of the circle is %f”, area);
return 0;
}

Output

Enter the radius of the circle: 12
The radius of the circle is 452.160004

Method 2 – by using the function

#include<stdio.h>
float area(int radius){
float area;
area = 3.14 * radius *radius;
return area;
}

int main()
{
int radius;

printf(“Enter the radius of the circle:”);
scanf(“%d”, &radius);
printf(“The area of the circle is %f”, area(radius));
return 0;
}

Output

Enter the radius of the circle:2
The area of the circle is 12.560000

In the first method, we simply calculate the area of a triangle by using a simple method in the second method we calculate the area of a triangle by using the function, I hope these programs are helpful to you to understand the concept to calculate the area of a triangle.