How to declare and define functions in objective-c like in c?

Question

My code looks like

- int add_two_numbers:(int)number1 secondnumber:(int)number2;

int main()
{
    return 0;
}

- int add_two_numbers:(int)number1 secondnumber:(int)number2
{
    return number1 + number2;
}

I got error saying "missing context for method declaration" and "expected method body". I am following the tutorials on tutorialpoints on objective-c, but it is very vague in this section. It seems like the methods have to be in some classes, and cannot go alone like what I did. What's going on?

That tutorial is doing an absolutely terrible job of teaching you about this. Functions exist in ObjC, distinctly from methods; they are related at a deeper level, but not the same thing. "Basically in Objective-C, we call the function as method" is nonsense. I would suggest finding another resource to learn from. Have a look at Good resources for learning ObjC — jscs
– jscs, Commented Jan 29, 2016 at 19:30
You could make that a normal C function: int add_two_numbers(int number1, int number2) — rmaddy
– rmaddy, Commented Jan 29, 2016 at 20:01
That tutorial is just flat out wrong in a number of places. I would recommend against using it for anything. — bbum
– bbum, Commented Jan 30, 2016 at 6:00

Lou Franco · Accepted Answer · 2016-01-29 19:30:12Z

5

Methods like the second one can only live in classes. You can use the C stand-alone syntax whenever you want a stand-alone function.

Also, your syntax is slightly off -- in a class, you'd declare it like this:

- (int)add_two_numbers:(int)number1 secondnumber:(int)number2
{
   return number1 + number2;
}

With the return type in parentheses.

answered Jan 29, 2016 at 19:30

Lou Franco

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1 Comment

bbum Over a year ago

Except you shouldn't use '_' and it should be camel cased. I.e. - (NSInteger) addNumberOne:(NSInteger)numberOne toSecondNumber:(NSInteger) numberTwo; or the like.

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