创建两个水平滚动条，用来控制X和Y数值的变化，X和Y的变化范围均为0～100，用编辑框显示X和Y的值，对滚动条的箭头或者滑块以及滑块和箭头中间的空隙操作时，编辑框的内容随时更新，并将计算的结果在窗口的另一个编辑框中显示出来。若直接对编辑框输入数据，然后在“计算”菜单中选择“求和”或“求差”，计算的结果在窗口的另一个编辑框中显示出来。-Create two horizontal scroll bar, used to control changes in X and Y values, X and Y were varied from 0 to 100, with the edit box shows the value of X and Y, the arrow on the scroll bar or slider and the slider and the gap between the arrow operation, to update the contents of the edit box, and the results of calculation to another edit box in the window display. If the input data directly to the edit box, and then " Calculate"　menu, select " Sum"　or " demand gap" , the calculated results of the other edit box in the window display.