1-1.c
#include "io51.h"
#include "stdio.h"

void time_delay( int dly_count)
{
while(dly_count>=0)
 dly_count--;
}

void main()
{
int i= 1;

while(1)
{
 P1= ~i;
 time_delay(10000);
 i++;
}
}