C-pointer essay

1. A pointer is a variable that stores the memory address of a computer.

Int A; Define a variable

Int *p;//defines a P-pointer

p = &a;//and int *p = &a; equivalent

Depending on where you appear, the operator * can be used to declare either a pointer variable or a pointer value. When used to declare a variable, * means that a pointer is declared here. Other cases use * to indicate the value of the pointer.

& is an address operator that can reference a memory address. Use the & operator before the variable name to get the memory address of the variable.

2. An array is a contiguous memory space that can store specific objects and pointers to store a single memory address. You can assign the address of the array to the pointer, and the pointer to the address of the first element of the array.

Int Arr[3] = n/A;

int *p = arr;//and int *p = &arr[0]; equivalent;

3. As with arrays, pointers to structs store the memory addresses of the first element of a struct.

4. The pointer's pointer holds the memory address of the first pointer

If P1 stores the P2 memory address, then *P1 is returning the object that P1 saved.

&: Take address. *: Value.

C-pointer essay