Can you use a variable in the name of a variable?

In this code I'm working on

Code:

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function(int n) {

block[3].whole = cashless1.displayData[1];

block[4].whole = cashless1.displayData[2];

block[5].whole = cashless1.displayData[3];

block[6].whole = cashless1.displayData[4];

block[7].whole = cashless1.displayData[5];

block[8].whole = cashless1.displayData[6];

          block[9].whole = cashless1.displayData[7];

block[2].whole = cashless1.displayData[0];

}

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I have two identical cashless payment devices with the only difference between them in the code being the number in their name/tag.
I have functions that are set up to interact with one cashless payment device at a time, and I'm trying to add the functionality of being able to switch betwween which device the functions interact with, by giving it a number when you call the function.

Is there a way to edit all the references/tags for the 'cashless1' device, and have something like 'cashless#' where the pound sign is a variable/number that inserts the value given to 'n' when you call the function? Basically is there a way you can insert 'n' into the cashless device variables so I don't have to make a new copy of each function for each device that exists?

No, there is no such thing as a "variable" variable name.

If I understand your situation, the best way to do it is to make the "cashless" variable a parameter to your function:

Code:

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typedef struct Cashless {
    int x, y;
} Cashless;
 
void function(Cashless *cashless) {
    cashless->x = 24;
    cashless->y = 42;
}
 
int main() {
    Cashless cashless1, cashless2;  // or use an array
    function(&cashless1);
    function(&cashless2);
    return 0;
}

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