How to use void function in c++

void functions in C do not return any value and are used to perform operations or modify program state. They can be used to: modify variables or function parameters to perform operations such as printing output, reading input, or calling other functions to control program flow such as using conditional statements or loops

Usage of void function in C

The void function in C is a function that does not return any value. They are typically used to perform specific operations or modify program state without returning any data.

Uses:

void functions are mainly used for the following purposes:

• Modify variables: They can modify functions Externally defined variables or function parameters.
• Perform operations: They can perform various operations, such as printing output, reading input, or calling other functions.
• Control program flow: They can control program flow, for example by using conditional statements or loops.

Syntax:

void function follows the following syntax:

<code class="cpp">void function_name(parameter_list) {
  // 函数体
}</code>

• function_name is the identifier of the function symbol.
• parameter_list is a function parameter list, where each parameter has a type and name.
• Function body Contains the code to be executed.

Example:

The following example demonstrates a void function printMessage, which prints a message:

<code class="cpp">void printMessage(string message) {
  cout << message << endl;
}

int main() {
  printMessage("Hello, world!");
  return 0;
}</code>

Output:

<code>Hello, world!</code>

Advantages:

The main advantages of using void functions include:

• Simplicity: They More concise than return functions because they do not require an explicit return statement.
• Efficiency: They are more efficient than returning functions because they do not require allocating and returning memory.
• Readability: They improve readability because they clearly indicate that the function returns no value.

Limitations:

The main limitations of using the void function are:

• The results cannot be obtained directly: Since the void function does not return any value, its result cannot be obtained directly.
• May cause side effects: void functions may cause side effects, such as modifying variables or throwing exceptions.

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