好几个错误，给你参考下
#include<reg52.h>
#define uint unsigned int
sbit LC=P1^0;
void delay(uint c)
{
    uint a,b;
    for (a=0; a<c; a++)
        for (b=0; b<124; b++);            
}

void main()
{
    LC=0;
    delay();
    LC=1;
    delay();
}