In this post, we will learn how to find the circumference of a circle using C Programming language.
The circumference of a circle is its boundary or the length of the complete arc of the circle.
The circumference of the circle can be calculated using the formula 2Ï€r, where ‘r‘ is the radius of the circle and Ï€ = 3.14.
We will be finding the circumference of the circle by using the following methods:
- Using Standard Method
- Using User-defined Function
So, without further ado, let’s begin this tutorial.
Contents
C Program to Find Circumference of Circle
// C Program to Find Circumference of Circle
#include <stdio.h>
int main(){
float radius, PI = 3.14, cf;
// Asking for input
printf("Enter the radius of the circle: ");
scanf("%f", &radius);
// Circumference
cf = 2 * PI * radius;
// Display output
printf("Circumference of Circle: %.2f", cf);
return 0;
}
Output
Enter the radius of the circle: 21
Circumference of Circle: 131.88
How Does This Program Work ?
float radius, PI = 3.14, cf;
In this program, we have declared three float data type variables named radius, Pi and cf.
// Asking for input
printf("Enter the radius of the circle: ");
scanf("%f", &radius);
Then, the user is asked to enter the radius of the circle.
// Circumference
cf = 2 * PI * radius;
We calculate the circumference of the circle using the formula 2Ï€r. The value of circumference gets stored in the cf named variable.
// Display output
printf("Circumference of Circle: %.2f", cf);
Finally, the result is displayed on the screen using printf() function. Here, we have used %.2f format specifier because we want to display the result only till 2 decimal places.
C Program to Find Circumference of Circle Using Function
// C Program to Find Circumference of Circle Using Function
#include <stdio.h>
float circumference(int radius){
return 2 * 3.14 * radius;
}
int main(){
float radius, cf;
// Asking for input
printf("Enter the radius of the circle: ");
scanf("%f", &radius);
// Finding circumference
cf = circumference(radius);
// Displaying output
printf("Circumference of the Circle: %.2f", cf);
return 0;
}
Output
Enter the radius of the circle: 7
Circumference of the Circle: 43.96
float circumference(int radius){
return 2 * 3.14 * radius;
}
In this program, we have defined a custom function named circumference which returns the circumference of the circle.
// Finding circumference
cf = circumference(radius);
Then, we call our custom function in the main function to display the circumference of the circle.
Conclusion
I hope after going through this post, you understand how to find the circumference of a circle using C Programming language.
If you have any doubt regarding the program, feel free to contact us in the comment section. We will be delighted to solve your query.
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