How does a C++ function return void type?

The void function in C does not return any value, and its syntax is void function_name(). Common uses include: Entering user input, such as getting the user's age and printing it to the console.

The return type of void function in C

In C, the void type is a special The return type means that the function does not return any value. This is different from other functions, which usually return a specific type of value, such as an integer, string, or object.

The syntax of the void function is as follows:

void function_name();

The following is an example of a simple function that returns the void type:

void print_hello() {
  std::cout << "Hello, world!" << std::endl;
}

You can use it by calling the function void function:

print_hello();

Calling a void function does not generate any return value, so you cannot assign the return value to a variable or use it as input to another expression.

Practical case: Entering the user’s age

A common use of the void function is to enter user input. Here is an example of a C program that uses the void function to get the age from the user and print it to the console:

#include <iostream>

void get_age() {
  int age;
  std::cout << "Enter your age: ";
  std::cin >> age;
  std::cout << "Your age is: " << age << std::endl;
}

int main() {
  get_age();
  return 0;
}

In the above example, get_age() The function uses void as the return type since it does not return any value. get_age() The function reads the age from the user and prints it to the console. main() The function calls the get_age() function to allow the user to enter their age and print it to the console.

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