Skip to main content

POINTERS---

Dynamic memory allocation cannot be performed without using pointers, so it is necessary to learn a pointers.
A pointer is a variable which holds the address of the another variable.
Pointer is also declared as other variable declared, but it use a asterisk(*) symbol, to represent that it is a pointer.

 Syntax:- data_types *variable_name;

 Example:-  int *p; // integer pointer

 Note:- A pointer can hold the address of that variable, which is same as pointer data types,i.e data types of pointer variable=data types of other variable.
          Every variable is a memory location, and every memory location has its own address which can be accessed by using ampersand(&) operator.

 Program:- to print the address of a variable: 
Use Pointer:- 


  • define a pointer variable
  • assign the address of the other variable into pointer variable
  • access the value at the address, from the pointer variable.It is done by using unary(*) operator. 
Program 2:- using a pointer variable
NOTE:- A pointer assigned NULL is known as null pointer,that is this pointer variable having value 0

Comments

Post a Comment

Popular Posts

Type casting

type casting or type conversion  allows us to convert one data types into another.for type casting cast operator is required. Syntax:--      (type)expression or value; Example:       int f =9/4; //without type casting       o/p=2       float f=(float)9/4;  //with type casting       o/p=2.3 Type conversion are of two types: 1)Implicit Type Conversion:-  it is also known as automatic type conversion.When the type conversion is performed automatically by the compiler,such type of conversion is known as implicit type conversion. 2)Explicit Type Conversion:-  the type conversion performed by the programmer is known as explicit type conversion.which is done by cast operator as above mentioned.
Post a Comment
Read more

Recursion--

Definition:- when a function call itself is called recursion. note:- the problem which is solved by recursion is also solved by loops, but it is not necessary the problem solved by loops is also solved by recursion.  Example:- Explanation:- 1) a fun function declared which takes argument and return value 2) main starts fun is called by passing 3 value 3)after calling fun definition starts, where check if a==1 no because a is 3, s=a+fun(a-1) means s=3+fun(2)  from here fun function is again called now this body again execute now a is 2, so s=3+fun(2), fun(2) is replaced by 2+fun(2-1=1) i.e s=3+2+fun(1) again fun function is called... overall s=3+2+1=6, s is return this return value goes where fun function is called , where return value is stored in k, so k=6 now print is 6. 
Post a Comment
Read more

UNION

Definition:-                 Union is similar to structure, except it allows you to define the variable that share storage spaces.Defining a means creating a new data types. How use union:-                       when we create a structure by using struct keyword, now making a union we just replace the keyword struct with the keyword union , other syntax will be same. Difference  between Structure  and Union:- the only difference between them is in memory. NOTE:-  union is used for low level programming but structure mostly used for high level programming. Program to access union:- """SHARE IT WITH YOUR FRIENDS IF HE DID NOT KNOW""""
Post a Comment
Read more