Functions

[CAP]

Ok I am reading that Sams' Teach Yourself C in 21 Days to try and get started right...well it talks briefly about a function that is in the code(which takes 2 variables, multiplies them and gives results)and I really confused, I thought it would be simple but I tried Javascript for a bit before like:
function whatever()
{
code here
}

and now C is using

int product a,b,c

and that is what a function looks like??
can someone explain to me how that is a function cause all I see it doing is delcaring 3 variables so....

[sean345]

A function looks like your first example:

function whatever() 
{ 
code here 
}

> int product a,b,c
This just declares 4 integer variables.

To make a program you were talking about you could do something like this:

//Prototype
int Product(int,int);

//main function
int main(void){
    int Total = Product(15,3);
    printf("%i\n", Total);
    return 0;
}

//Product function
int Product(int Num1, int Num2){
    return (Num1*Num2);
}

- Sean

[Unregistered]

CAP, int product a, b, c is the function call. When the flow through main reaches int product a, b, c, it sends 2 numbers to the function. The function then multiplies the numbers together and returns an int. If this isn't clear, ask more questions.

[Unregistered]

CAP, I think I've given you some bad info, however int product a,b,c doesn't make any sense to me. Could you check it please.

[CAP]

I am sorry about my first post.
I made a mistake when reading through it all, what I did was (somewhere around 1 or 2 am ) I merged(although I don't know what the hell I was thinking) both
int a,b,c
and
int product(int x, int y)

I am sorry to all of you who posted to try and answer my stupid question.
I still don't get it but it makes more sense to me now so once again I am sorry.

[Shiro]

>int a,b,c

These are three variables.

>int product(int x, int y)

This is a function. The variables x and y are the input parameters, the name product is the name of the function. It has int in front, which tells that the function is of type int. This means that the function returns a value which can be assigned to a variable of type int.

So you can do something like this:

a = product (b, c);

Now the variables b and c are used as input and the value returned by the function product is stored in variable a.

[CAP]

Ok that makes a whole lot more sense thanks Shiro.
I played around with some javascript before so I can see what you are saying.

The first one with int product(int x, int y) is a bit confusing but the second one with a = product(int x, int y) is super clear, now I will go and read somemore on my book, thanks a lot.