Question

I have an EditText where the user enters a number.

Is there a way of setting the significant figures?
So it would automatically change "003645" to "365" at 3.s.f.

Answer 1

Like this:

  // input, you have to read your EditText
  String input = "003645";    // your example
  int significantFigures = 3; // your example

  // calculation
  int number = Integer.parseInt(input, 10);
  int tooBig = (int) Math.pow(10, significantFigures);
  while (number > tooBig) {
      number = (int) Math.round(number / 10.0);
  }
  System.out.println(number); // prints 365

This will produce 1000 for input 001000 and 3 significant numbers. If it should produce 100 for the same input and significant amount of numbers you need to use greater or equals in the while condition.