Towers of Hanoi with Classes

Question

I keep getting the Error C2228 left of '.topDisk' must have class/struct/union and I have no idea what it means, or even how to fix it, even after some research. Is it possible for someone to explain what the error is and how to fix it? I think I've provided you with all the code you need.

HanoiPegClass.cpp File

//A function moving one disk from one peg to another
void moveDisk(Peg& beginning, Peg& destination)
{
    assert(beginning.getNumDisks() > 0);
    if (destination.getNumDisks() > 0)
    {
        //Where the error is
        assert(beginning.getNumDisks.topDisk() < destination.getNumDisks.topDisk());
    }

    destination.addDisk(beginning.topDisk());
    beginning.removeDisk();
}

Peg.cpp File

//Function to return the disk count (amount of discs on each peg)
unsigned int Peg::getNumDisks() 
{
    return diskStack.size();
}

//Function to return the value of the top disk
int Peg::topDisk()
{
    return diskStack.back();    
}

Peg.h File

#pragma once
#include <vector>
#include <string>
using namespace std;

class Peg
{

private:
    vector<int> diskStack;
    string pegName;
    void setName(string name);
public:
    Peg(string name, int totalDisks);
    unsigned int getNumDisks();
    void printDisks();
    string getName();
    int topDisk();
    void addDisk(int totalDisks);
    int removeDisk();
    ~Peg();
};

Answer 1

getNumDisks is a function which returns an unsigned integer, so you cannot use a . on it. You can use the . operator on a structure or class or union only. So change

assert(beginning.getNumDisks.topDisk() < destination.getNumDisks.topDisk());

to

assert(beginning.topDisk() < destination.topDisk());