C code for operation of a switch

How to write a code for the operation of a hardware switch ?

It can be a simple digital switch to switch it ON and OFF.

How about saying something about what OS/Compiler/interfaces you've got?

You can assume.

Is this what you answered on the interview?

Code:

#define ON 1
#define OFF 0

#define ON_OFF_SWITCH_ADDR 0xC0000400

int *on_off_switch_ptr = (int *)ON_OFF_SWITCH_ADDR;

int main(int argc, char **argv)
{
   if (argc != 2)
      printf("Invalid arguments\n");
   else {
       if (strcmp(argv[1], "ON") == 0)
         *on_off_swtich_ptr = ON;
       else if (strcmp(argv[1], "OFF") == 0)
         *on_off_swtich_ptr = OFF; 
       else printf("Choose either ON or OFF\n");
   }
   return 0;
}

--
Mats

I had told the same n of course it is correct.

But i was expecting anyother approach for this. Is there any other approach for d same ?

There is any number of answers - how you do it depends on what the enviroment is.

--
Mats

Yes there is, look up the truth tables for the bitwise operators & | ^