The role of void in C language

In C language, void is a keyword that indicates no return value. It is used in various scenarios, such as: a function that declares no return value: void print_message(); a function that declares no parameter: void print_message(void); a function that defines no return value: void print_message() { printf("Hello world\n"); } A function that defines no parameter: void print_message(void) { printf("Hello world\n"); } As a pointer: int *ptr; // A pointer to an int type variable, void *ptr; // A pointer to arbitrary type of data

The role of void in C language

definition:

void is a keyword in C language that indicates that there is no return value.

use:

void is mainly used in the following scenarios:

• Function declaration without return value:

 void print_message();

• Function declaration without parameters:

 void print_message(void);

• Function definition without return value:

 void print_message() {
  printf("Hello world\n");
}

• Function definition without parameters:

 void print_message(void) {
  printf("Hello world\n");
}

• pointer:

 int *ptr; // Pointer to int type variable void *ptr; // Pointer to arbitrary type of data

advantage:

Using void has the following advantages:

• Improve code readability: It clearly shows that the function has no return value or parameters.
• Prevent errors: Since no value can be returned, potential errors that return invalid values ​​are avoided.
• Improve flexibility: void pointers can point to any type of variable, improving code flexibility.

limitation:

• Unable to get the function execution result: Since the void function has no return value, it cannot get its execution result.
• Cast: When using a void pointer, casting is required to access the variable pointed to, which may cause an error.

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