Use function to write down variable name in Arduino

Question

I have a script in Arduino that'll get a letter, and to make things as short a possible I'd like to use a string combined with another variable to get the variable name I need to fill in into the function.

I'd like this because I have a function mySwitch.send(Int, 24). For the first Int variable I need to to send a number that is dependent on the letter I sent, and on the current value of A_stat, I defined these values in variables A_aan, A_uit, B_aan, B_uit, etc.

For example for the letter A I need to fill in the variable A_aan if a_stat == 0. If a_stat == 1 it needs to fill in A_off.

For B I need to fill in the variable B_aan if b_stat == 0, and I need to fill in the variable name B_uit on the place of Int if b_stat == 1.

frarugi87 · Accepted Answer · 2015-12-23 10:06:58Z

Since the value of the variable vary at runtime, the only solution in my opinion is to use some functions.

For instance, if you want to get #_aan, where # is the value in a variable, you can use the following function:

int get_aan(char carat)
{
    switch(carat)
    {
        case 'A':
            return A_aan;
        case 'B':
            return B_aan;
        ...
    }
    return AN_INVALID_VALUE_YOU_DEFINE;
}

Remember to define an invalid value somewhere.

If you have to set that value, you can write a similar set function:

void set_aan(char carat, char value)
{
    switch(carat)
    {
        case 'A':
            A_aan = value;
            break;
        case 'B':
            B_aan = value;
            break;
        ...
    }
}

You can also include some flags. For instance, if you wanted to get variable A_aan when A_stat = 0 and A_off when A_stat != 0, and repeat this for every variable, just modify the first function in:

int get_the_val(char carat)
{
    switch(carat)
    {
        case 'A':
            if (A_stat)
                return A_off;
            else
                return A_aan;
        case 'B':
            if (B_stat)
                return B_off;
            else
                return B_aan;
        ...
    }
    return AN_INVALID_VALUE_YOU_DEFINE;
}

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