Operator overloading in C++
- 1. G.BALAJI MCA, M.Tech., Assistant Professor of Computer Science Vivekananda College, Madurai
- 2. Operator Overloading: Operator – It is a symbol that indicates an operation. Arithmetic operators are + (add two numbers), - (subtract two numbers), * ( Multiply two numbers), / ( Divide between two numbers). At now, we will take an Addition ‘+’ Sign, its use of ‘+’ sign is 5+5=10 2.5+2.5=5
- 3. Operator Overloading means multiple functions or multiple jobs. In operator overloading the ‘+’ sign use of add the two objects. One of C++’s great features is its extensibility, Operator Overloading is major functionality related to extensibility. In C++, most of operators can be overloaded so that they can perform special operations relative to the classes you create.
- 4. For Example, ‘+’ operator can be overloaded to perform an operation of string concatenation along with its pre-defined job of adding two numeric values. When an operator is overloaded, none of its original meaning will be lost. After overloading the appropriate operators, you can use C++’s built in data types.
- 5. Unary Operator - Operators attached to a single operand. (-a, +a, --a, ++a, a--, a++) Binary Operator - Operators attached to two operand. (a-b, a+b, a*b, a/b, a%b, a>b, a<b )
- 6. return-type class-name:: operator op(arg-list) { function body } EXPLANATION return type – It is the type of value returned by the specified operation. op - It is the operator being overloaded. It may be unary or binary operator. It is preceded by the keyword operator. operator op - It is the function name, Where operator is a keyword.
- 7. Overloaded operator functions can be invoked by expressions such as: For unary operator: op x or op y eg: +a, -a, ++b, b--. For binary operator: x op y eg: a+b, a*b, a<b. Only existing operators can be overloaded. New operators cannot be created. The overloaded operator must have at least one operand that is of user-defined type.
- 8. We cannot change the basic meaning of an operator. Overloaded operators follow the syntax rules of the original operators. The following operators that cannot be overloaded. Size of Size of operator . Membership operator .* Pointer-to-member operator :: Scope resolution operator ?; Conditional Operator