[Solved] how to work on stl stacks inside functions c++? [closed]

Question

Your fill function takes the parameter a by value, which means a copy is made. No changes to a inside the function will affect the variable you passed to the function.

I suggest you make the function pass the object by reference:

void fill(stack<int>& a, int cap)

Now changes to a will update the object your passed. The fact that you may be passing a global variable to the function doesn’t matter here.

Accepted Answer

Your fill function takes the parameter a by value, which means a copy is made. No changes to a inside the function will affect the variable you passed to the function.

I suggest you make the function pass the object by reference:

void fill(stack<int>& a, int cap)

Now changes to a will update the object your passed. The fact that you may be passing a global variable to the function doesn’t matter here.