How is a pointer defined in C language?

2 years ago
Liam
1 minute

In the C language, pointers can be defined in the following way:

  1. Adding the “*” symbol before a variable name indicates that the variable is a pointer variable. For example:
  2. Declare a pointer variable pointing to an integer, a pointer variable pointing to a float, and a pointer variable pointing to a character.
  3. You can define a pointer type that points to a specific type using the typedef keyword and use that type to define pointer variables. For example:
  4. Define a pointer variable that points to an integer.
  5. One option:
    You can directly use the address of an existing variable to initialize a pointer variable. For example:
  6. Define a pointer variable that points to an integer and initialize it to the address of num.

It is important to note that pointer variables are used to store memory addresses, not actual values. To access or modify the value they point to, the dereference operator “*” must be used. For example:

int num = 10;
int *ptr = #   // 定义一个指向整数的指针变量，并将其初始化为num的地址
printf("%d", *ptr);   // 输出指针所指向的值，即输出10
*ptr = 20;   // 修改指针所指向的值为20
printf("%d", num);   // 输出修改后的值，即输出20
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