可以通过不同按键实现数码管显示0到20这些数，两个数码管一个代表各位，一个代表十位
#include <reg51.h>
#define uchar unsigned char
sbit K1=P2^0;
sbit K2=P2^1;
sbit K3=P2^2;
sbit K4=P2^3;
uchar code F[]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F,0x3F,0x06,0x5B,0x4F,0x66,0x6D};
uchar code S[]={0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x3F,0x06,0x06,0x06,0x06,0x06,0x06};
void main()
{
while(1)
{
uchar b,fir,sec,third,forth;
fir=K1;
sec=K2;
third=K3;
forth=K4;
b=fir*8+sec*4+third*2+forth*1;
P0=F[15-b];
P1=S[15-b];
}
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