Prime Number in Dart

Welcome to the Prime Number in Dart page! Here, you'll find the source code for this program as well as a description of how the program works.

Current Solution

// Issue 4970
import 'dart:math';
void main(List<String> args){
  const String error_message= "Usage: please input a non-negative integer";
  if (args.isEmpty){
    print(error_message);
    return;
  }
  try{
    int num_needed = int.parse(args[0]);
    if (num_needed.isNegative){
      print(error_message);
      return;
    }

    // If the number is even number other than 2 OR if number is either 0 or 1, Print Composite
    if( (num_needed == 0)|| (num_needed == 1) || (num_needed %2 ==0 && num_needed != 2) ){
      print("Composite");
      return;
    }
    bool is_prime = true;    
    int max_divisor = sqrt(num_needed).toInt();
    for (int i_index = 3; i_index <= max_divisor; i_index +=2){
      if(num_needed % i_index == 0){
        is_prime = false;
        break;
      }
    }

    print(is_prime ? "Prime" : "Composite");
  }
  catch(e){
    print(error_message);
  }
}

Prime Number in Dart was written by:

• gangaasoonu

If you see anything you'd like to change or update, please consider contributing.

How to Implement the Solution

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How to Run the Solution

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