Ejdzbikej's questions

正如主题所示，我提出了下面提出的解决方案，但我觉得它很愚蠢，可以用更有效的方式重写。

请给我一些反馈或建议。

import 'dart:io';

void main() {
  // the while true loop is here only so I don't have to hit RUN every time to check another nuber
  while (true) {
    // Prompts user for input ( on the same line )
    stdout.write("Enter the number: ");
    var userInput = int.parse(stdin.readLineSync()!);
    int divisor;
    int numberOfFactors = 0;
    var listOfFactors = [];

    for (divisor = 1; divisor <= userInput; divisor++) {
      if (userInput % divisor == 0) {
        numberOfFactors++;
        listOfFactors.add(divisor);
      }
    }

    // formats the display of end output( is that even in English? xD)
    var formattedList = listOfFactors.toString().replaceAll('[', '').replaceAll(']', '');

    if (numberOfFactors > 2) {
      print("Provided number is not prime, and the factors are ${formattedList}");
    } else {
      print(
          "Provided number is prime, because it has only two factors: ${listOfFactors[0]} and ${listOfFactors[1]}");
    }
  }
}