static void Main(string[] args)
{
FourOperations fourOperations = new FourOperations();
fourOperations.Sum(5, 6);
fourOperations.Sum(7, 3);
}
static void Main(string[] args)
{
FourOperations fourOp = new FourOperations();
fourOp.Sum(5, 6);
fourOp.Sum(8, 6);
}