class Calculation
{
	public int Add( int a, int b ) { return a + b; }
	public int Sub( int a, int b ) { return a - b; }
	public int Mul( int a, int b ) { return a * b; }
	public int Div( int a, int b )
	{
		if( ( a == 0 ) || ( b == 0 ) )
			return 0;
		else
			return a / b;
	}
	public void Print( int c )
	{
		System.Console.WriteLine( "Print : {0}", c );
	}
}