How to generate a 15 digits number in flutter

Question

in my project i have shipments, I want to generate a random number of 15 digits to be used to track. How to achieve that?

Does this answer your question? [How do I generate random numbers in Dart?](https://stackoverflow.com/questions/11674820/how-do-i-generate-random-numbers-in-dart) — esentis, Nov 17 '21 at 12:40

score 0 · Answer 1 · answered Nov 17 '21 at 12:46

Try below code hope its helpful to you. refer Random here

import 'dart:math';
main(){
  var number ="";
  var randomnumber=  Random();
   //chnage i < 15 on your digits need 
  for (var i = 0; i < 15; i++) {
  number = number + randomnumber.nextInt(9).toString();
  }
  print(number);
}

Your output : 353572614254280

score 0 · Answer 2 · answered Nov 17 '21 at 12:47

0

import 'dart:math';
Random random = new Random();
int rNumber = random.nextInt(10^15); // 15 digits (0 to 999999999999999)
int rNumber2 = random.nextInt(10^15) + 10^14; // 100000000000000 to 999999999999999

answered Nov 17 '21 at 12:47

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Nice answer, but `10^15` should be `pow(10, 15)`. – enzo Nov 17 '21 at 13:25

score 0 · Answer 3 · answered Nov 17 '21 at 12:52

Well I don't know if there is any "optimal" way to do that but you can try the following using math library of dart.

  String generate15Digits(){
    var rng = Random();
    String generatedNumber = '';
    for(int i=0;i<15;i++){
      generatedNumber += (rng.nextInt(9)+1).toString();
    
    }
  
    return generatedNumber;
}

Also do keep in mind that the first digit will never be zero (because we are adding 1 to every digit), and you need to add import 'dart:math' library

How to generate a 15 digits number in flutter

3 Answers3