Explanation of Pointers in C++
In C++, pointers play a crucial role in managing memory and accessing data. This comprehensive guide covers the fundamentals of pointers, including classes, objects, referencing and dereferencing operators, as well as practical examples. Understand how to declare, use, and manipulate pointers effectively in your C++ programs.
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Presentation Transcript
POINTER CONTENTS Pointer. Explanation of Class. Explaination of Object. Referencing Operator & Dereferencing Operator. Program Explanation. Explaination of Pointer to Object.
CLASS # A Class is a user defined data type which has data member & member functions. # It is declared by using keyword Class . # Syntax : Class class_name { access specifier : data members; member function () }; # Example: Class car { private : int spd lmt ; int inc.spd ; };
Object # An object is an instance(occurence) of a class, when a class is defined no memory is allocated but when object is created memory is allocated. # Syntax: Class_name obj_name; # Example: Class student { private : int roll; char name [10]; public : void getdata () void putdata () };
Pointer to Object # Just like other pointers, the object pointers are declared by placing in front of a object pointer s name. # Syntax : class_name * object_pointer_name; # Eg. date * ptr; # To access the public members using an object Dot ( . ) operator is used, and to access public membes using object pointer, the arrow ( -> ) operator is used
Pointers # Pointer is a vaiable which is used to store memory address of another variable. # Pointer is basically derived data type of C++. # Declaration of Pointer Syntax: data_type * variable_name; Eg. 1. int * ptr; 2. float * ptr; 3. char * ptr;
REFERENCING OPERATOR & DEREFERENCING OPERATOR 1) Address of Operator (Reference operator &) :- Syntax- e.g P=&X; &variable name 2) Dereferencing Operator ( Value of Operator * ):- e.g y=*p;
