How to fix - Unused declaration of function 'product'

Question

I am trying to run a program which I copied from a source code. It keeps showing the warning

"Unused declaration of function   'product'" for this line: int product(int x, int y);

And I don't know how to fix it.

Answer 1

There must be a prototype declaration of that function, that was not used, meaning, the function itself was not defined.

Just find the line int product(int x, int y); and comment it. By adding 2 //

//int product(int x, int y);

The warning would go.