Difference between the Char declarations

#1
  1. char *a
    2.char a[]
    3.char *a = new char[size]
#2

@gamecreator762

  1. char *a;
    a is a pointer to a character.
  2. char a[100] ;
    a is the name of a character array. Here the size of that array is 100. That is , a points to the starting location of the 100 blocks of char which have been allocated continuously. The memory is allocated at compile time.
  3. char *a = new char[100] ;
    a is a pointer that has been allocated memory of 100 char blocks. The memory is allocated at runtime.

The essential difference between 2 and 3 is that in case 2, you cannot shift the a pointer to any other location later in the code.
char a[100];
a = new char[20] ; // Invalid … will give an error.
This is because a is the name of an array. You can also consider it to be a constant pointer.
In case 3 , you can shift the a pointer later in your code as well if you wish.
char *a = new char[100];
a = new char[20];
This code will work perfectly fine and won’t give any error.
Note - Do not use this in practice as there is a memory leak in this code snippet.

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#3

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