Area of Circle Example C Program

About this program

This is an example program in c calculation programs. Read the concept first: Data Types in C Programming, then study the code and output below.

Definition

The area of a circle is π (Pi) times the Radius squared, which is written A=πr2.

Formula

The area of a circle is written

A=πr2

here,

r = Radius
π = ~3.14

Area Of Circle Example Program

/*##Area Of Circle*/
/*##Calculation Programs, Datatype Programs, Basic Programs*/

#include<stdio.h>

int main(){
   float radius, area;

   printf("\nEnter the radius of Circle : ");
   scanf("%f", &radius);

   area = 3.14 * radius * radius;
   printf("\nArea of Circle : %f", area);

   return (0);
}

Sample Output

Output is:
Enter the radius of Circle: 2.0
Area of Circle:12.57

How It Works

This C program demonstrates Area of Circle Example C. It first reads the required values as input, then performs the core operation step by step, and finally prints the output shown in the Sample Output above.

1. Declare the variables that hold the program’s data.
2. Read the input values that the program will work with.
3. Print the final result to the console so you can compare it with the sample output.

Try changing the input values and re-running the program to see how the output changes — this is the fastest way to understand how the logic behaves.

Related Pages

Learn the concept first, then study the code:

• C Programs — Browse all C Programs.
• Data Types in C Programming — Concept — int, float, double and format specifiers.
• Area Of Square Example C Program — More in c calculation programs.
• Area Of Rectangle Example C Program — More in c calculation programs.