采用并行口实现数字0~9、A~F、L、U、P、n总共20个键盘 并将按键的结果用7段数码管显示出来-Using the parallel port for digital 0 ~ 9, A ~ F, L, U, P, n total 20 keyboard The results and key with 7-segment displays

proteus单片机仿真-数码管（动态） #include<reg51.H> unsigned char code Tab[] {0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90} unsigned char Dat[] {0,0,0,0} unsigned char tmp,i,j unsigned char s 0 void delay(int n) { int i for(i 0