how can you tell if a binary number is negative or positive?(adsbygoogle = window.adsbygoogle || []).push({});

1111 <--- how do you know if this is 15 or -1?

and for my project i have to make a 4 bit subtracter using LED lights to show 1's or 0's. Do I just leave it in 2's complement form?

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Binary number.

**Physics Forums | Science Articles, Homework Help, Discussion**