Is there a way to explicitly call optional arguments in c++?

Question

When I create a function such as:

int addThree(int x=1, int y=1, int z=1)

I want to call the function such that it uses the default arguments for x and z, but not y.

Some attempts have been addThree(5,,5) and addThree(5,NULL,5), but neither work effectively.

Answer 1

The default arguments must be at the last of your list, so do as follows

int addThree(int y , int x = 1, int z = 1)
{
    //some stuff
    return someInt;
}

, hence you can call it as

int ans = addThree(4);