Why '&&' and not '&'?

Question

Why is && preferable to & and || preferable to |?

I asked someone who\'s been programming for years a

Answer 1

&& is the short circuit version of &.

If we are evaluating false & true, we already know from looking at the first argument that the result will be false. The && version of the operator will return a result as soon as it can, rather than evaluate the whole expression. There is also a similar verion of the | operator, ||.