建立图形演示系统菜单，包括plot,option,quit,三项。建立数制转换对话框。在左边输入一个十进制整数和2～16之间的数，单击“转换”按钮能在右边得到十进制数所对应的2～16进制字符串，单击“退出”按钮退出对话框-Create a graphical presentation system menu, including the plot, option, quit, three. Build number system conversion dialog box. The left and enter a decimal integer number between 2 to 16, click the " Convert"　button to get to the right of the decimal number corresponding to the binary string of 2 to 16, click " Exit"　button to exit the dialog box