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HomeBackend DevelopmentC#.Net TutorialWhat does * in C language mean?

What does * in C language mean?

May 07, 2024 am 08:18 AM
c language

The * symbol in C language has five meanings: 1. Pointer operator, declares a pointer; 2. Gets the value of the variable pointed by the pointer; 3. Gets the address of the variable pointed by the pointer; 4. Indirect addressing operator , access the variable pointed by the pointer; 5. Dereference operator, obtain the reference of the type pointed by the pointer.

What does * in C language mean?

The * symbol in C language

The asterisk (*) in C language is an operator , has the following meanings:

1. Pointer operator

  • is used to declare a pointer. For example:

    int *ptr;  // 声明一个指向 int 类型的指针
  • is used to get the value of the variable pointed to by the pointer. For example:

    *ptr = 10;  // 将 ptr 指向的变量赋值为 10
  • is used to get the address of the variable pointed to by the pointer. For example:

    int num = 20;
    int *ptr = #  // 将 ptr 指向 num 变量的地址

2. The indirect addressing operator

  • is used to access variables pointed to by pointers. Equivalent to using the pointer operator to obtain the value of the variable pointed to by the pointer. For example:

    *ptr++  // 等同于 ++(*ptr)

3. The dereference operator

  • is used to obtain a reference to the type pointed to by the pointer. For example:

    struct student *stu;
    struct student& stu_ref = *stu;  // 获取 stu 指向的 student 类型的引用

4. The multiplication operator

  • is used to perform multiplication operations. For example:

    int x = 5;
    int y = 2;
    int z = x * y;  // z 的值为 10

5. Dereference pointer

  • is used to dereference a pointer and return the variable it points to. the address of. For example:

    int *ptr;  // 声明一个指向 int 类型的指针
    int num = 20;
    ptr = # // ptr 指向 num 变量的地址
    *ptr;  // 解引用 ptr,返回 num 变量的地址

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