Thread: Helph me !

Hello that I am trying to make a function to tell me how to know if a byte is powered on or not but it must be through a mask depending on the position you send

bool estaEncendido(char byte,int pos)
{
//  byte = byte<<(7-pos) ;
  //byte = byte>>(pos+1);
  int mask=1;
  int result =1;
  for(pos=0; pos<8; pos++, mask <<=1)
  {
    if((byte & mask) !=0)
    {
        result = 0;
        break;
    }
    //return byte;
  }
}

In the main should have been as well

System.out.print(estaEncendido(5/*000000101*/,2/*00000100*/));
/*00000101 */
/*00000100 &*/
/*00000100*/This ignition

I'm not sure I understand what you're asking, but consider this:

If you AND the existing register with a value that has ONLY the desired bit set to 1, then the result will either be all zeros or the same as the value you passed. If all zeros, the bit in question was not set. If the result is the same as that passed, then the desired value is set to one.

For example, if the status register is:

11010100

and I want to know if the 4th bit from the right is set, then I would AND the above with

00001000

to get:

11010100
00001000
--------------
00000000

which indicates that the bit was not set.

I want to generate a mask by means of the position as you aria ? For example if you control the position 3 that I send the 00000100 in order to make a &