What is the difference between *p+1 and *(p+1)

The difference is: 1. *p represents the content stored in the memory address pointed by this pointer, p represents the name of a pointer variable; 2. *p is generally a variable or constant that is consistent with the pointer type, p The output is a hexadecimal number; 3. *p tells the program to retrieve data from that address, and p stores the address.

The operating environment of this tutorial: Windows 7 system, C 17 version, Dell G3 computer.

In C language, *p and p are commonly used in pointers to represent a pointer variable. The difference between *p and p is:

1. The meanings are different

* p represents the content stored in the memory address pointed to by this pointer.

p represents the name of a pointer variable, which refers to the memory address pointed to by the pointer variable.

2. The output format is different

*p is generally a variable or constant that is consistent with the pointer type.

p outputs a hexadecimal number and outputs the address of a pointer.

3. Different functions

*p Let the program go to that address to retrieve the data.

p stores the address.

Examples:

1,

int a[5]={1,2,3,4,5};
int *p=a;//这是在定义指针变量p的同时就直接给它初始化，即把数组a的首地址赋给它。

2,

int a[5]={1,2,3,4,5};
int *p;//声明指针变量p
p = a;

Extended information

(*p) operation is an operation that returns the value of p as the value of the address space. (&p) is an operation that returns the address opened when p was declared. You can use assignment statements to assign values ​​to memory addresses.

Example:

int *p;
p=2003H;
*p=3000H

Result:

**p=*(*(p))=*(*(2003H))=*(3000H)=3000H。
&&p=&(&(p))=&(3001H)，此时出错了，3001H 是个常数无法存放地址。
*&p=*(&(p))=*(3001H)=2003H，也就是*&p=p。

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