Used Void and then did not use Void? I don't understand why?

[paulobo]

Why do I have "Void Main Colors" and then just "Main Colors". Is void necessary or just a good habit??

void setup()
{

  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);
}


void loop()
{

  mainColors();

  showSpectrum();
}

void mainColors()
{

[sterretje]

void mainColors()
{
}

is a function definition.

mainColors();

is a function call. It calls the function.

---

Note
Why do you use bold text? A lot of people don't like it because it's considered shouting.

In this case it does not add anything to your question either; use it sparingly to emphasize something.

[jremington]

In the function definition, the keyword "void" preceding the function name indicates that the function does not return a value.

[gilshultz]

I understand it can be confusing, but consider this: the compiler is straightforward and expects a function to return something when it’s called. If the function doesn’t return a value, you must specify void in the first part of the declaration. This tells the compiler that the function returns nothing.

Here’s a breakdown:

1. First Spot (Return Type):
   This specifies what the function will return. It can be void (nothing), byte, int, or another data type.
2. Second Spot (Function Name):
   This is the name you give the function so you can call it in your code.
3. Third Spot (Parameters):
   The parentheses () define the parameters passed to the function. These can be:
   • Local: Declared within the function, e.g., (byte x).
   • Global: Accessed directly from anywhere in the program.
4. fourth Spot {code}:
   This is where the code goes that performs your function.

Here’s a simple example:

void printMessage() { // 'void' means this function returns nothing
    Serial.println("Hello, World!");
}

int addNumbers(int a, int b) { // Returns an int and takes two int parameters
    return a + b;
}

void loop() {
    printMessage(); // Calls the first function
    int sum = addNumbers(5, 7); // Calls the second function and stores the result
    Serial.println(sum); // Prints 12
}

For more clarity, here’s a helpful resource for understanding C++ functions. While it’s not entirely Arduino-specific, almost everything applies and will give you a solid foundation: https://www.youtube.com/c/CodeBeauty

[paulobo]

Thank you for your detailed explanation.