Parameters

[dalawh]

Some important parameters for functions are poin
void somethingHappens (int *a); //pointers

void somethingHappens (int& a); //address

void somethingHappens (int arg[]); //array
If I was to use the functions above, how would it look like? Give me examples.

Am I missing any other important ones?

[dalawh]

Anyone else able to help me with this?

[dalawh]

Anyone able to figure this out or know this?

[Peter87]

The first and third function is the same, and takes a pointer as argument. You can pass an array to the function because arrays can be implicitly converted to a pointer to the first element.

If you have a pointer to an int that you want to pass to the function you just pass it as it is.

int* p;
// Don't forget to initialize the pointer before passing it to the function.
somethingHappens(p)

If you have an int variable, and you want to pass a pointer to that variable to the function you can use operator&.

int i;
somethingHappens(&i);

Passing an array will look like this.

int array[3] = {1, 2, 3};
somethingHappens(array);

What is actually passed to the function is a pointer to the first element in the array, which is 1 in the example above.


The second function takes a reference to an int as argument. If you have an int variable, and you want to pass a reference to that variable to the function you just pass it as it is.

int i;
somethingHappens(i);

[AbstractionAnon]

int a;
somethingHappens(&a);  // pass pointer to a 

int a;
somethingHappens(a);  // pass a by reference 

int a[5];
somethingHappens(a);  // pass a as an array 

Missing:

void somethingHappens(int a);  // by value

int a;
somethingHappens(a);  //  pass a by value 

Clear?

[dalawh]

@Peter87
@AbstractionAnon
Thanks for explaining everything to me. This cleared up a lot of my confusion.

[Royeiln]

i have same problem... but after visited this page.... problem almost solve..

[zb0S216C]

I'd just like to point something out: if you need to change the value of a built-in type through a function, don't pass it by reference; instead, prefer to return the new value:

int CreateNew_Value(int CurrentValue)
{
    return(CurrentValue + ...);
}

int main( )
{
    int Value(0);
    
    // Do something...
    Value = CreateNew_Value(Value);
}

_Wazzak

[dalawh]

@Royeiln
What other problems do you still have?