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Pointer in c++ part1

A pointer is a variable that stores the memory address of another variable. Pointers hold addresses, while regular variables hold values. Computer memory is divided into sequentially numbered locations, with each variable assigned a unique address. Pointers allow manipulation of memory at a low level, making C++ suitable for embedded and real-time applications. Declaring a pointer simply requires specifying its type, like int*, and it reserves memory to hold an address. Pointers must be initialized, like int* pointer = 0, to avoid being "wild" pointers pointing to unknown memory. The address operator & returns a variable's address, which can be stored in a pointer.

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Author – Subhasis Nayak
 A pointer is a variable that holds a memory address. That’s it.  This is what the difference in between variable and pointer. ◦ Pointer holds the address ◦ Variable holds the value.
 Computer memory is divided into sequentially numbered memory locations. Each variable is located at a unique location in memory, known as its address. Memory representation
 Thecapability to use pointers and manipulate memory at a low level is one of the factors that makes C++ the language of choice for embedded and real-time applications.
 Different computers number this memory using different complex schemes.  We must happy, as a programmer, We don’t need to know the particular address of any given variable because the compiler handles the details.  If we want this information, though, you can use the address-of operator (&), which returns the address of an object in memory.
 It is so simple to declare a pointer. We need the type of the pointer  Next the name of the pointer.  When we declare a pointer variable such as pointer, the compiler sets aside enough memory to hold an address int *pointer;
 A pointer that is not initialized is called a wild pointer because you have no idea what it is pointing to.  If you want to initialize you can as like we do for variable. int *intPointer = 0;  A pointer whose value is zero is called a null pointer.  All pointers, when they are created, should be initialized to something.
 Every variable has an address. Even without knowing the specific address, you can store a variable’s address in a pointer. Declaring pointer Passing address
Holds the value Holds the address
 Type must be same to the variable whose address is going to pass to the pointer.  When you want to pass the address of the variable use (&) before the variable name.  When you want to pass the value use (*) before the pointer.