What is a pointer?
The pointer in C language is a variable which  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable the address of another  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable. This  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable can be of type int, char, array,  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable, or any other pointer. The size of the  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable depends on the  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable. However, in 32-bit architecture the size of a pointer is  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable byte.

How to declare a pointer?
The pointer in c language can be  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable using * (asterisk symbol). It is also known as  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable pointer used to  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable a pointer.
int *a;//pointer to int
char *c;// 2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable to char

What are the Advantages of pointer?
1) Pointer  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable the code and improves the performance, it is used to  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable strings, trees, etc. and used with arrays, structures, and  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable.
2) We can return multiple  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable from a function using the pointer.
3) It makes you able to access any memory  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable in the computer's  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable.

What is Address of (&) operator?
The  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable of operator '&'  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable the address of a  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable. But, we need to use %u to  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable the address of a  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable.

What is NULL pointer?
A  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable that is not assigned any  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable but  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable is known as the NULL pointer. If you don't have any  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable to be  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable in the pointer at the time of  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable, you can  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable NULL  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable. It will provide a better approach.

How to read the pointer: int (*p)[10].
To read the  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable, we must see that () and [] have the equal  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable. Therefore, their  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable must be considered here. The  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable is left to right, so the priority goes to ().
Inside the  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable (),  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable operator * and pointer name (identifier) p have the  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable precedence. Therefore, their associativity must be considered here which is right to left, so the  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable goes to p, and the second  2addressarchitectureassignassociativitybracketdeclarationdeclareddereferencedisplayfunctionfunctionsindirectionlocationmemoryNULLpointerprecedencepriorityreducesretrievingreturnssamespecifiedstoresvaluevaluesvariable goes to *.