Overload Unary Minus Operator in C++

This C++ program overloads the minus(-) operator. The program defines a class and instantiates it. The minus operator is defined inside the class. The value of two objects can be subtracted using this operator.

Here is the source code of the C++ program which overloads the minus(-) operator. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

```
/*
```

 * C++ Program to overload minus (-) operator

```
 */
```
```
#include <iostream>
```
```
using namespace std;
```
```
 
```
```
class Integer {
```
```
    private:
```
```
        int value;
```
```
    public:
```
```
        Integer(int v) : value(v) { }
```
```
        Integer operator-(Integer i) {
```
```
            value = value - i.value;
```
```
            return *this;
```
```
        }
```
```
	int getValue() { 
```
```
            return value;
```
```
        }
```
```
};
```
```
 
```
```
int main()
```
```
{
```
```
    Integer a(10), b(20);
```
```
 
```

    cout << "a = " << a.getValue() << "\n";

    cout << "b = " << b.getValue() << "\n";

    cout << "a - b = " << (a -b).getValue() << "\n";

```
}
```

$ a.out
a = 10
b = 20
a - b = -10

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