Functions

Question

A program that calculates the area of a circle using functions. So area of a circle is Pi*r² right? So I have the question in function calling when I call the function can I write it down like (please assume the variables are already given) :
Answer = area_circle (radius, radius, pi);
And in case you want to know the prototype I have written it's:
int area_circle ( int, float);
P. S - Second day I touched functions and I am finding it confusing so please let me know where I have gone wrong.

Answer 1

I would recommend you to give the prototype as-
int area_circle(double,double); OR
int area_circle(float,float);
Also while passing the variables you need not give radius twice. You can write -
answer = area_circle(radius,pi);

Answer 2

Sure! Thank you! So you mean to say while we are doing the function call we just use the elements required to do the calculation right?
Also I haven't declared pi in the main function I have declared it in the function body is that okay?

Answer 3

Yes but if you are not declaring the pi inside main then you should only pass radius in the function call.