A void function is a function that does not return a value to its caller. The void keyword is specified as the function’s return type to indicate that the function performs an operation without producing a return value.

A void function can still accept parameters and perform calculations or other operations. When execution reaches the end of the function body, control returns to the calling code.

Source Code #

#include <iostream>

void displayMessage()
{
    std::cout << "Welcome to C++.\n";
}

int main()
{
    displayMessage();

    return 0;
}

Output #

Welcome to C++.

Explanation #

• void displayMessage() defines a function named displayMessage with no return value.
• void specifies that the function does not return a value to its caller.
• displayMessage(); calls the function from main().
• The statement inside the function body executes when the function is called.
• A void function does not require a return statement to return a value.
• A return; statement without a value can still be used in a void function to terminate the function early.
• After reaching the end of the function body, control returns to the statement following the function call.
• return 0; terminates the program successfully.