Confused about CircleClass

[bug2207]

I'm not so sure what to do here. I just need a little bit of direction as to where I should start.

#include<iostream.h>
#include<lvp\string.h>
#include"StringUtility.h"
#include<lvp\CIRCLE.h>
#include<math.h>
int main()
{
	CircleClass tire(17);
	cout<<getVolume();//don't know what to put here
	return(0);
}
//----------------------------------------------------------------------------
double getVolume(const CircleClass &obj)
/*Determines the volume of the sphere based upon the Circle object parameter*/
{
	int Radius;
	obj.SetRadius(Radius);
	return (double(4/3)*double(3.14*(pow(Radius,3))));
}

[keskiverto]

Line 9 calls function getVolume that does not have any parameters.

Lines 13-17 define function getVolume that takes one parameter. The function uses the parameter like it were a number representing radius(?) even though the parameter has type CircleClass.


Note: double(4/3) is same as double(1).

[bug2207]

I made an edit, not sure if it makes any more sense.

[keskiverto]

First, in order to call "getVolume" on line 9, the function has to be already declared before the main() starts. Does one of the included headers declare getVolume? I bet not.

If you want to call a function that takes a reference parameter, you have to call it with a parameter. For example:

int foo( double & );

int main() {
  double bar = 7.42;
  int gaz = foo( bar );
  return 0;
}

What does the CircleClass::SetRadius do?