求用C语言编程实现51单片机的LED灯移动

#include<reg51.h>
#define uchar unsigned char
sbit c10=P1^0;
sbit c11=P1^1;
sbit c12=P1^2;
sbit c13=P1^3;
uchar led1,led3;
void delay(uchar a)
{
uchar i,j;