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Update README.md #43

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8 changes: 5 additions & 3 deletions pointersInC/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
* Variable that contains address in memory of another variable
* We can have a pointer to any variable type
* Unary or monadic operator & gives the `address of a variable`
* operator * gives the `contents of an object pointed to by a pointer`
* Dereferencing operator (*) gives the `contents of an object pointed to by a pointer`
* To declare a pointer to a variable :
```c
datatype * name_Of_Variable;  
Expand Down Expand Up @@ -34,7 +34,9 @@

Here,
* P stores the memory address of a.
* *P stores the value of a
* When P is called it uses the memory stored in it i.e., Address of a, and points towards it for the purpose of code.
* *P stores the value of a.
* Basically, *P refers as P dereferenced by the * (Dereferencing operator) i.e., pointing on a and uses the value/data stored at the address of a.

### Dereferencing a pointer variable
```c
Expand Down Expand Up @@ -112,7 +114,7 @@ Allocation of memory space at run time.
* For example, an int array of 10 elements can be allocated as: `int * array = (int *) calloc (10, sizeof (int));`

#### Difference between malloc() and calloc()
* Calloc allocates multiple blocks of data whereas malloc allocates as a single block 
* Calloc allocates multiple blocks (which might exist at different memory addresses in the memory) of data whereas malloc allocates as a single block (whihc is a single continuous set of memory assigned to the pointer)
* Calloc initializes all bytes in the allocation block to zero

### realloc()
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