Why '&&' and not '&'?

Question

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

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

Answer 1

Because && and || are used for flow control just like if/else are. It isn’t always about conditionals. It is perfectly reasonable to write as a statement, not as an if or a while conditional, the following:

 a() && b() && c() && d();

or even

 w() || x() || y() || z();

It’s not just that it those are easier to type than the equivalent if/else versions; they are also much easier to read and understand.