And / Or Logic in C

[sweenster]

I never really use these double-queries much. can anyone tell me if this code is valid?

(If a=1 and b=1 OR a=1 and c=1 then...)


if (a=1 && b=1 || a=1 && c=1)
{
....
} else {
...
}

[shmoove]

Looks almost right. You have to use "==" to compare instead of "=". "=" is only an assignment operator.

Also, I can never remember the precedence of the boolean operators so I never take my chances and use parenthesis (but I'm pretty sure && has higher precedence so they're probably not necessary:

if ((a==1 && b==1) || (a==1 && c==1))


shmoove

[boris]

&& (AND) always has higher precedence than || (OR)
just so you know

and the code can be simplified
if(a == 1 && (b == 1 || c == 1))

[ecnarongi]

for extra credit does anyone know the full precedence order??? :D

[cpradio]

I know the precedence of the operators I use most often.
http://www.difranco.net/cop2220/op-prec.htm