问题
I wrote this:
if( a == -11 && b == -1 ){
{
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?
回答1:
You use && for “and”, and || for “or”.
回答2:
(a == -11 && b == -1) is fine and correct. Objective-C uses all of the same logical operators as C. || is the logical-or operator.
回答3:
if (a==-11 && b==-1) {
if perfectly legal in C, and therefore Objective-C.
Your second example is not C or Objective-C
来源：https://stackoverflow.com/questions/6118338/how-do-i-make-and-or-or-expressions