Testing my sorting algorithm Error: control reaches end of non-void function

Question

I would like to run this to see if it works. It is supposed to sort an table of integers, but I don't know how the main function is supossed to look like. How do I enter *tab into the function?

void    swap(int *a, int *b)
{
    int buffer;

    buffer = *a;
    *a = *b;
    *b = buffer;
}

sort_int_tab(int *tab, int size)
{
    int a;
    int z;

    z = 0;
    while(z < size)
        {
            a = 1;
            while(a < size)
                {
                    if(tab[z] >= tab[a])
                        {
                            swap(&tab[z], &tab[a]);
                        }
                        z++;
                }
        }       a++;
        z++;
}

int main(void)
{
    
    sort_int_tab();
    return ();
}

Answer 1

There are two important issues in your code. First, your function does not have a return type. Since you are not returning anything, it should be void :

void sort_int_tab(int *tab, int size) {
    /// Your code...
}

Second, inside of main, you are calling the function without arguments. You should pass an array of int (remember to allocate memory and initialise it), and the size of the array:

sort_int_tab(tab, size);

You can initialize an array like this and then pass it to your function:

int tab [5] = { 3, 4, 1, 2, 5};
sort_int_tab(tab, 5);