Thread: calculating area of a circle using user-defined function

Hi

I'm getting this error:
error: void value not ignored as it ought to be

Could you please tell me the reason for this? Do you find my code correct? Any suggestion? Please help me. Thanks.

Code:

// calculating area of a circle using user-defined function

#include <iostream>
#include <cstdlib>

using namespace std;

void area(float);

int main()

{
    float r; float a;

	cout << "enter radius: "; cin >> r;

	a = area(r);

	cout << a;

	return 0;

	system("pause");
}

//------------------------------------
// area(int), function definition

        void area(float v)

		{
			float a;
			a = 3.1416*(v*v);

		}
//--------------------------------------

error: void value not ignored as it ought to be|

Well perhaps you should return a float, rather than void.

Thank you, Salem.

The amended code is:

Code:

// calculating area of a circle using user-defined function

#include <iostream>
#include <cstdlib>

using namespace std;

float area(float);

int main()

{
    float r; float a;

	cout << "enter radius: "; cin >> r;

	a = area(r);

	cout << a;

	return 0;

	system("pause");
}

//------------------------------------
// area(int), function definition

        float area(float v)

		{
			float Area;

			Area = 3.1416*(v*v);

			return Area;

		}
//--------------------------------------

>>error: void value not ignored as it ought to be|
This simply means that the function you are calling has a return type of void but you are trying to assign the return value of that function to a variable.
This obviously cannot be done since the function returns nothing.

Thanks, Elysia.