这个程序这样更简明
#include "reg51.h"
#define uchar unsigned char
void delay(unsigned long int t);
uchar code seg[]={0xc0,0xa4,0x99,0x82,0x80,0xf9,0xb0,0x92,0xf8,0x90,0x01};
void delay(unsigned int t);
void main(void)
{
        uchar i;
        while(1)
    {
                P0=seg[i];
                delay(20000);
                i++;
                if(seg[i]==0x01)i=0;
    }
}
void delay(unsigned long int t)
{
        while(--t);
}