Question

How to implement the prefix ++ Increment operator overloading in C++

Answer 1

#include <iostream>

class OperatorOverloading
{
	private:
		int n;
	public:
		OperatorOverloading() : n(0) {  }
		void operator ++()
		{
			n++;
		}
		void Display()
		{
			std::cout << "n = " << n << std::endl;
		}
};

int main()
{
	OperatorOverloading obj;

	obj.Display();
	
	++obj;

	obj.Display();

	return 0;
}



/*
run:

n = 0
n = 1

*/

 

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Answer 2

#include <iostream>

class OperatorOverloading
{
	private:
		int n;
	public:
		OperatorOverloading() : n(0) {  }

		OperatorOverloading operator ++()
		{
			OperatorOverloading tmp;
			n++;
			tmp.n = n;

			return tmp;
		}
		void Display()
		{
			std::cout << "n = " << n << std::endl;
		}
};

int main()
{
	OperatorOverloading objA, objB;

	objA.Display();
	objB.Display();

	objB = ++objA;

	objA.Display();
	objB.Display();

	return 0;
}



/*
run:

n = 0
n = 0
n = 1
n = 1

*/

 

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