2. 在显示九九表时有十种颜色变化如：按0—9键分别对应有十种不同颜色1. 二进制转换十进制的显示子程序能自动消除高位的0-2. In the show 99 Table 10 kinds of color change from time to time such as: key 0-9, respectively, according to dozens of different colors corresponding to 1. Binary conversion decimal dis