--a0 a1 a2的输入我们用 k1 k2 k3 代替

--b0 b1 b2的输入我们用拨码开关代替。

--b0用拨码开关1输入，BMK1用杜邦线接24脚

--b1用拨码开关2输入，BMK2用杜邦线接25脚

--b2用拨码开关3输入，BMK3用杜邦线接26脚

--一开始数码管显示的是0.应为111-111就等于0

--数码管显示相减结果-- A0 a1 a2 input we use k1 k2 k3 instead the- b0 b1 b2 input, we use DIP switches instead.- B0 DIP switch input, BMK1 with DuPont line by 24 feet- b1 DIP switch 2 input, BMK2 with DuPont line by 25 feet- b2 DIP switch 3 input, BMK3 connected with DuPont line 26 feet- a digital display of 0 is equivalent to 111-111 0- digital display subtraction results