How do I make AND or OR expressions?

I wrote this:

if( a == -11 && b == -1 ){
{
开发者_运维百科
if( a == -1) AND ( b == -1)...

But neither work, and I have the same problem with OR. How do I write expressions that include OR or AND?

You use && for “and”, and || for “or”.

(a == -11 && b == -1) is fine and correct. Objective-C uses all of the same logical operators as C. || is the logical-or operator.

if (a==-11 && b==-1) {

if perfectly legal in C, and therefore Objective-C.

Your second example is not C or Objective-C