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Closed 12 years ago.
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Is there a difference between YES/No,TRUE/FALSE and true/false in objective-c?
What is the difference between upper boolean and lower boolean? Ex: true and TRUE. Thanks for any answers!
It depends on the language... Some languages only like True or False (Python), some like all lowercase (Java - I think), and some don't care (PHP, Ruby)
Related
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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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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;
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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.
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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 :))
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Coalesce operator and Conditional operator in VB.NET [duplicate]
(4 answers)
Closed 2 years ago.
Possible Duplicates:
Coalesce operator and Conditional operator in VB.NET
Is there a VB.NET equivalent for C#'s ?? operator?
Is there a built-in VB.NET equivalent to the C# null coalescing operator?
Yes, there is, a long as you're using VB 9 or later (included with Visual Studio 2008).
You can use the version of the If operator overloaded to accept only two arguments:
Dim myVar? As Integer = Nothing
Console.WriteLine(If(myVar, 7))
More information can be found here in a blog post by the VB.NET team.
(Yes, this is an operator, even though it looks like a function. It will compile down to the same IL as the "proper" null-coalescing operator in C#.)
Example
Dim b As Boolean?
Console.WriteLine("{0}.", If(b, "this is expected when b is nothing"))
'output: this is expected when b is nothing.
b = False
Console.WriteLine("{0}.", If(b, "this is unexpected when b is false"))
'output: False.
b = True
Console.WriteLine("{0}.", If(b, "this is unexpected when b is true"))
'output: True.
According to this question it would seem the answer is If()
No. Use GetValueOrDefault; that's why it's there!
I don't believe that there is a built in VB.Net equivalent, but here's an answer: null coalesce operator in VB.Net(8)