How to use void function in c++

The void function in C does not return any value and is used to perform specific tasks. They are used to print messages, initialize data structures, respond to input, or perform other specific operations that do not return information.

void function in C

void function is a function in C that does not return any value. They are usually used to perform a specific task without caring about the return value.

Using void functions

Using void functions is very simple. The function declaration and definition are as follows:

<code class="cpp">// 函数声明
void function_name(参数列表);

// 函数定义
void function_name(参数列表) {
  // 函数体
}</code>

Example

The following is an example of a void function that prints "Hello World!":

<code class="cpp">#include <iostream>

void printHelloWorld() {
  std::cout << "Hello World!" << std::endl;
}

int main() {
  printHelloWorld();
  return 0;
}</code>

In the main function After calling the printHelloWorld function in , it will print "Hello World!".

When to use void functions

void functions are typically used to perform the following tasks:

• Perform specific tasks such as printing messages or updating Status
• Initializing or cleaning data structures
• Responding to user input or events

Notes

##void Functions cannot return any value. The compiler will generate an error if you try to return a value.
• void functions can have parameters, but these parameters will not affect the return value of the function.
• void functions can call other functions, including functions that return values.

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