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What does *a mean in c++

May 09, 2024 am 02:15 AM
c++

*a in C represents a pointer reference, pointing to the memory address of variable a. This pointer can be used to access and modify variable values, dynamically allocate memory, and create data structures.

What does *a mean in c++

*a in C

In the C programming language, *a represents a pointer reference to variable a.

The meaning of pointer

A pointer is a special type of variable that stores the memory address of another variable. This allows you to access and modify the value of other variables through pointers.

Grammar

*a’s syntax is as follows:

type *variable_name;
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where:

  • type Is the type of variable pointed to by the pointer.
  • variable_name is the name of the pointer variable.

Usage

*a can be used for the following purposes:

  • Access and modify the value of a variable without directly referencing the variable .
  • Dynamically allocate memory.
  • Create data structures such as linked lists and trees.

Example

The following code creates a pointer to the integer variable a:

int a = 10;
int *ptr = &a;
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Now, it can be accessed and modified through the pointer ptr Variable a:

*ptr = 20; // 将 a 的值更改为 20
int value = *ptr; // 获取 a 的值,该值为 20
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