This question already has answers here:
Array declaration in FORTRAN for beginners
(2 answers)
Closed 6 years ago.
I am trying to understand a Fortran90 code. In the code, I found this expression for initializing a variable:
integer :: time(8)
What is meant by this? What does the parenthesis do?
That syntax declares an INTEGER rank one array of size eight.
(In Fortran terminology that source does not initialize anything and it is a declaration, not an expression.)
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This question already has answers here:
ios programming - Data argument not used by format string
(2 answers)
Closed 6 years ago.
Hi there I'm trying to do an NSLog but what I want to see is what it's inside of my dictionary like this.
NSLog(#"diccionario", diccionario);
And this warning appears:
Data argument not used by format string
The diccionario object contains data from a server so like I said I want to print in the console the info that diccionario contains, because is not printing anything.
Thanks.
NSLog(#"diccionario : %#", diccionario);
Should be the solution.
This question already has answers here:
what does dollar sign mean in objective-c?
(2 answers)
Closed 9 years ago.
I'm still new to objective-c I went through a code example from git hub and saw '$' notation before parameters for example:
titleLabel.$height = TITLE_HEIGHT;
can some one explain the difference between titleLabel.$height and titleLabel.height
The property happens to include a dollar sign in its name, it has no significance.
For Example:
#property int $height;
This question already has answers here:
Objective C - Why do constants start with k
(6 answers)
Closed 9 years ago.
I have always wondered, when you define something such as a string (or anything for that matter), why do people put a 'k' ahead of the defined name?
e.g. #define kHello = #"Hello"
What's that 'k' all about?
I'm pretty sure the 'k' is short for constant. (Don't ask me why it's a k.)
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Does Objective-C use short-circuit evaluation?
If an object is of a certain type, and a property of that object has a certain value, I want to do something.
Can I use:
if (objectIsOfType:x && object.property == y)
or do I need to nest these? Assume that asking for object.property will through an error if the object is not of type x.
No. Objective C (as C and many other languages) uses short circuit evaluation.
Objective-C supports short-circuit evaluation(from left to right).
but in any way, you need to check object on nil :))
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
Caret in objective C
I just want to know what this ^ symbol means in Objective-C.
It can mean several things:
type (^name)(arguments)
is a declaration of a block object.
^(arguments) { ... }
is a block object literal
x ^ y
is the bitwise XOR operator
It is used to define blocks in later versions of iOS. See http://developer.apple.com/library/ios/#documentation/cocoa/Conceptual/Blocks/Articles/00_Introduction.html
It means a couple of things:
It can mean bitwise XOR.
It can also signify a pointer to a block (just like * is marks a pointer to a function).