public class Op_Type
{
private int which_op;

public Op_Type()
{which_op = -1;}

public void ADD_OP()
{which_op = 0;}

public void SUB_OP()
{which_op = 1;}

public void MULT_OP()
{which_op = 2;}

public void DIV_OP()
{which_op = 3;}

public int Which_Op()
{return which_op;}
}