how to convert string to variable

Raz

how can I convert String to variable? like: String a="int x=100"; and now I will convert it to variable in the sketch. how to do this?

Alex_Pr

Short answer, you can't. There is no such way to create executable commands from a string.

You can however develop a system with which to analyse the string and store a given value to its respective variable in a predetermined array.

Like this:

String[] variables = {"x", "a", "b", "c", ...};
int Is, If;
int[] values = new int[4];   //same length as variables[]

void setup(){
}

void draw(){
  String a="int x=158;";

  if (a.indexOf("int ")!=-1){
    for (int i=0; i<variables.length; i++){
      Is = a.indexOf("int ")+4;
      If = a.indexOf("=");
      if (trim(a.substring(Is, If)).equals(variables[i])){
        Is = a.indexOf("=")+1;
        If = a.indexOf(";");
        values[i] = int(a.substring(Is, If));
      }
    }
  }

  println(values[0]);
}

It is obvious that to use more data types you need to enhance the code.

Raz

Thank you! I have 2 questions: 1) how can I do if sentence which check where is an character or string (which place)? Like

String a="int x=0";

if "n" is in the second place?

2) How can I convert string to variable name? Like: String b="x";

int (string b)=0;

How can I convert it to int x=0;?

Alex_Pr

Both your questions are answered in my example !

1) https://processing.org/reference/String_indexOf_.html

2) You cannot just create lines of executable code from input strings... The way to create new variables is as I have shown. With an indication array storing the variable's name and a value array storing its value.