用AT89C51单片机编写一个C语言程序实现2个数码管秒计数器，用4个按键分别控制暂停、加一秒、减一秒和继续

#include #define uchar unsigned char; uchar LED1,LED2; uchar distab[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; uchar num=0;sec,key; void delay(unsigned int a) { unsigned int i,j; for(i=0;i<a;i++) for(j=0;j<120;j++); } void d