电磁继电器切换

#include<reg52.h>
sbit relay=P3^3;
void delay(void)
{
    unsigned int i,j;
    for(i=0;i<100;i++)
    {
    for(j=0;j<100;j++)
        {
        }
    }
}
void main(void)
{
   while(1)
   {
     relay=1;
     delay();
     relay=0;
     delay();
   }
}