All about Pointers

Replies

• 

  Manish Goyal

  No reply so far
  
  come on guys ,didn't you find any problem while working with pointers?If yes, then share it
• 

  sachin bankar

  Pointer is a variable which holds address of another variable
• 

  Ankita Katdare

  Thank you Goyal for starting this thread.
  Everyone learning C or C++ faces problems with pointers at the beginner level.
  
  Could someone start with explaining the basics of pointers and their various forms?
• 

  Deepika Bansal

  Pointers have some relation with with 1D and 2D arrays. I'm quoting the example of a C++ program.
  

  void main()
  {
  int a[5];    //creating an integer array to store upto 5 integers
  cout<This was the case of static sized arrays ie size of the array is known at the compile time. 
  
  eg:- consider the following code-->
  
  //this is okay
  const int size=5;   //creating a constant variable
  int a[size];
  
  //but this is wrong
  int size=5;
  int a[size];
   so to create dynamic arrays (eg when size has to be known from the user), we make use of pointers as-->
  
  int size;
  int *a;   //uninitialized pointer
  cout<<"Enter the size of the array: ";
  cin>>size;   //got the array size from the user
  a=new int[size];  //a can now hold upto 'size' number of variables
  
  //now the elements of 'a' can be accessed in any of the 2 ways discussed above.
  Also there is a difference between int a=new int[size]; and int a=new int(size);
  
  int a=new int[size]; will create an array 'a' of size/length='size'.
  
  but int a=new int(size); will create an int variable ie only 2 bytes will be allocated to 'a' whose value or memory content will be='size'.
  
  
  
  
  
  PS: It's been very long that I've revised my C++ concepts. If anyone finds any error or ambiguity, please do let me know.😀 Will try to post the maximum of my knowledge about pointers.😛