C Program for Circumference of a Circle

The Circumference of a Circle can be calculated using the formulae 2*PI*r

In the below c program, the PI value taken as 3.14.

All the values dealing with Decimals, so float is a Datatype. 

int is not a right datatype, it will remove all the decimal parts of output.


int main ()

float radius, circumference;

printf (” Enter the Radius of Circle:”);

scanf (“%f”, &radius);

circumference = 2 * 3.14 * radius;

printf (“\nThe Circumference of a Circle is %f”, circumference);

return 0;


Output for Circumference of a Circle:

Enter the Radius of Circle:8

The Circumference of a Circle is 50.240002

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