Trying to build overloading class, function returns a funny number

[AL88]

Hi Im trying to build my 1st class to do some overloading but before i got to that part my box get its area function is returning a funny overflow number instead of 50. Why?

#include<iostream>

using namespace std;

class Box
{
	public:
	int SetitsHeight(int height) {height = itsHeight;}
	int SetitsLength(int length){length= itsLength;}
	int SetitsWidth(int width){width = itsWidth;}
	int GetitsHeight(){return itsHeight;}
	int GetitsLength(){return itsLength;}
	int GetitsWidth(){return itsWidth;}
	int GetitsArea(){return itsArea;}
	
	Box operator+(Box & spare)
	{
		Box box;
		box.itsWidth = this->itsWidth + spare.itsWidth;
		box.itsLength = this->itsLength + spare.itsLength;
		box.itsHeight = this->itsHeight + spare.itsWidth;
		box.itsArea = this->itsArea + spare.itsArea;
		return box;
	}
	
	private:
	int itsWidth;
	int itsLength;
	int itsHeight;
	int itsArea = itsWidth*itsLength*itsHeight;
	
};

int main()
{
	Box Box1;
	Box1.SetitsHeight(5);
	Box1.SetitsWidth(5);
	Box1.SetitsLength(5);
	cout << "Box1s area is " << Box1.GetitsArea()<< endl;
}

[Ganado]

	int itsWidth;
	int itsLength;
	int itsHeight;
	int itsArea = itsWidth*itsLength*itsHeight;

That isn't how variables work. You can't assign itsArea before itsWidth, itsLength, and itsHeight have valid values.

If you want itsArea to be a calculation dependent on itsWidth, itsLength, and itsHeight, turn it into a function instead:

int GetitsArea() { return itsWidth * itsLength * itsHeight };


box.itsHeight = this->itsHeight + spare.itsWidth;
Copy-paste typo? Did you mean to do spare.itsHeight here?

PS: Very odd style to prepend everything with "its". Kinda needless verbosity, in my humble opinion.