#include<reg51.h>
typedef unsigned char u8;
typedef unsigned int u16;
sbit led2=P2^1;
sbit led4=P2^3;
sbit led6=P2^5;
sbit led8=P2^7;
void delay(u16 i)
{
while(i--);
}
void main()
{
while(1)
{
led2=0;
led4=0;
led6=0;
led8=0;
delay(50000);
led2=1;
led4=1;
led6=1;
led8=1;
delay(50000);
}
}
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