![Memory Management Operators
• Unary operators new and delete
• Alice known as free store operators.
• An object created by new and destroyed by
delete.
• GF:
Pointer variable = new data type;
Pointer variable = new data type(value);
Pointer variable = new data type[size];
a = new int;
int *p = new int; (or) *p = 25;
Int *p = new int (25);
Int *p = new int [10];](https://image.slidesharecdn.com/operatorsinc-200328071032/85/Operators-and-expression-in-c-5-320.jpg)
![• Delete:
When the data object is not needed, it is
destroyed by using delete operator to free up
the memory space.
GF:
delete pointer variable;
delete [size] pointer variable;
delete p;
delete [] p;](https://image.slidesharecdn.com/operatorsinc-200328071032/85/Operators-and-expression-in-c-6-320.jpg)
Operators and expression in c++
- 1. OPERATORS IN C++ K.THAMIZHSELVI Asst. Prof. of Computer Science Bon Secours College for Women, Thanjavur
- 2. Other New Operators • Scope Resolution Operator (::) • Pointer to member Declarator (::*) • Pointer to Member Operator (-> , .*) • Memory release Operator (delete) • Memory Allocation Operator (new) • Line feed Operator (endl) • Field width Operator (setw)
- 3. Scope Resolution Operator :: variable name Global variable can be access from within the inner block using Scope resolution operator.
- 4. Member Dereferencing Operators • C++ allow to define class of different data types and functions. • Also permit to access class member through pointers. • 3 types: – Pointer to member Declarator (::*) – Pointer to Member Operator (-> , .*)
- 5. Memory Management Operators • Unary operators new and delete • Alice known as free store operators. • An object created by new and destroyed by delete. • GF: Pointer variable = new data type; Pointer variable = new data type(value); Pointer variable = new data type[size]; a = new int; int *p = new int; (or) *p = 25; Int *p = new int (25); Int *p = new int [10];
- 6. • Delete: When the data object is not needed, it is destroyed by using delete operator to free up the memory space. GF: delete pointer variable; delete [size] pointer variable; delete p; delete [] p;
- 7. Manipulators • endl – output statement – new line character • setw – to display in right justification – specify the width • Eg: cout<< setw(5) <<sum <<endl; 3 4 5
- 8. EXPRESSIONS • Combination of operators, constants and variables. • 7 types: – Constant expression – Integer expression – Float expression – Pointer expression – Relational expression – Logical expression – Bitwise expression
- 9. SPECIAL ASSIGNMENT EXPRESSION • Chained Assignment x = y = 5; • Embedded Assignment x = (y = 50) + 10; • Compound Assignment x + = 10;
- 10. THANK YOU