iphone integer multiplication

Question

I don't understand why this doesn't work:

[abc = ([def intValue] - 71) * 6];

'*' should be the viable way of doing multiplication and 'abc' is defined as an NSInteger. ('def' is an NSString)

Answer 1

Use e.g. the following instead:

NSInteger abc;
abc = ([def intValue] - 71) * 6;

Not everything in Objective-C is of class-type, e.g.:

• NSInteger
• NSUInteger
• NSPoint
• ...

I also don't know where you got that idea of doing the assignment inside the square brackets in the first place - i strongly recommend to read through the Introduction to The Objective-C Programming Language.