Why '&&' and not '&'?

Question

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

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

Answer 1

Simply,

if exp1 && exp2

if exp1 is flase don't check exp2

but

if exp1 & exp2

if exp1 is false Or true check exp2

and rarely people use & because they rarely want to check exp2 if exp1 is false