operator overloading

[ghost1166]

Hi iam new to c++.
i have learn operator overloading and write one program but it shows errors.
i dont understand whats wrong with the code.please anyone help me with this.
the program is of overloading operator ++(increment)& --(decrement).

  #include <iostream>
using namespace std;
class Test
{
    int a;
public:
    Test()
    {
        a=0;
    }
    void operator++()
    {
        a++;
    }
    void operator--()
    {
        a--;
    }
    void show()
    {
        cout<<"a value is:"<<a;
    }
};
int main()
{
    Test t1;
    t1++;
    t1.show();
    t1--;
    t1.show();
    return 0;
}

[t009]

If you want to focus on the increment and decrement operators, it might make things less complicated if you try to not use a class.(There are errors are some errors with the way you use the class)

I think using increments and decrements with for loops might be a good idea to start.

Try making a loop that increments/decrements a number 5 times and prints out each increment/decrement.

[tpb]

Your overloads of operator++ and operator-- are both prefix versions.
But your main is using postfix versions.
Postfix versions are defined by including a "dummy" int parameter.

#include <iostream>
using namespace std;

class Test {
    int a;
public:
    Test() {
        a=0;
    }

    // Prefix operators
    Test operator++() {
        ++a;
        return *this;
    }
    Test operator--() {
        --a;
        return *this;
    }

    // Postfix operators
    Test operator++(int) {
        Test t = *this;  // for postfix, you need to return a copy of the object before the change
        ++a;
        return t;
    }
    Test operator--(int) {
        Test t = *this;
        --a;
        return t;
    }

    void show() {
        cout << "a value is:" << a << '\n';
    }
};

int main() {
    Test t1;

    Test t2 = t1++;
    t1.show();
    t2.show();

    t2 = ++t1;
    cout<<'\n';
    t1.show();
    t2.show();

    t2 = t1--;
    cout<<'\n';
    t1.show();
    t2.show();

    t2 = --t1;
    cout<<'\n';
    t1.show();
    t2.show();

    return 0;
}

[ghost1166]

Thanks.u r right, it works.