Please do tell me what does an exclamation mark mean before a NSString
NSString *theString;
if (!theString);
cheers;
Please do tell me what does an exclamation mark mean before a NSString NSString
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Please do tell me what does an exclamation mark mean before a NSString
NSString *theString;
if (!theString);
cheers;
The
!symbol here (and in front of any expression whose type is a pointer) returns a true (1) result if the pointer isNULLand false (0) otherwise. The!theStringexpression is then just a short way of sayingtheString == NULL.