Calling a variable from one segment to another

Using Arduino Programming Questions
1

Hello, I can't figure this out nor do I know if it's even possible.
Here is my delima....
I have a segment like below

Void ledprogram(xyz) (number of case desired, case one RGB follow, case 2 flash ect)

However I have a few cases that need more variables like color, speed.

What I'm trying to do is when input the first part ledprogram(2) it works fine. But how can I make it where if I choose 3 instead of 2 the variables for 3 need to passed. So case 3 needs additional information where case 2 doesn't
I was thinking like if led program 3 is called that selection can be 0assed to another case that has the variables already done.

I'm really stuck here I appreciate any help provided and please don't think I'm dumb :=)

2

i think when you wrote "segment" you mean "function"
and i'm not sure if by "case" you mean argument.

in the example below, you can define a function with default argument values. in the case below, the function can be called with 1 or 2 arguments. if you specify just one argument, the 2nd argument has a default value of zero

void
myFunc (
    int arg1,
    int arg2 = 0)
{
    printf (" %s: %d %d\n", __func__, arg1, arg2);
}

this example runs on my laptop where printf() can be used

3

Sorry for my bad terms. Im lost on your example. let me add some code in to make better sense.....

  void ledsprogram(0, effect, bright) {
  
    EEPROM.put(0, effect);
  FastLED.setBrightness(bright);

  switch(effect) {
    
    case 0  : {
                 RGBLoop();
                break;
              }
Now i need to pass the effect variable to

 EEPROM.get(0, effect); 
  FastLED.show          then from what every value effect is , i need to take that value and use it to do another case list (like one above) which has the variable (speed, fade, ect.) already filled out, Is this making sense?
4

?
are you simply saying different processing is needed for each value of "effect"

    switch(effect) {
     case 0:
         ...
         break;

     case 1:
         ...
         break;

     case 2:
         ...
         break;

     case 3:
         ...
         break;
    }
5

Yes. But not all of them say case 1 has no variables. Case two has 3. Case 3 has 2.

I was thinking of Making another case list
So if effect gives the value of 3

I want to return 3 on my other case list that has the variables filled out already. Or would there be a better way?

6

no sure what you're asking

if some "effects" don't need all the arguments, just set the unnecessary arguments to zero when the function is called.

7

Oh OK! I'll try that didn't know 0 was a way to null or skip that veroable

8

it could be any value, right, because that effect doesn't use the value

9

Another way is to make a 'variadic' function: one that takes a variable number of arguments.
https://en.cppreference.com/w/cpp/utility/variadic

10

Hello
Another way to work with different parameter per function is to work with structured data block and a reference.

11

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