Question

我有点困惑。我想使用while循环将所有从2开始的素数打印到java中输入的数字，并且不想使用n / 2逻辑。我不知道我的代码有什么问题。请帮助我。

这里是代码：-

var data;
var request = new XMLHttpRequest();

request.open('GET', 'js/tender-total-data.json');

request.onreadystatechange = function () {
  if (request.status === 200 && request.readyState === 4) {
    data = JSON.parse(request.responseText);
    data.stores.forEach(function(key, val){
      console.log("The key is: ", key, "The value is; ", val);
      val.attendants.forEach(a => console.log("Attendant Name: ",a.attendantName));
      console.log(val.storeId);
    })

  }
};

request.send();

Answer 1

更简单的方法：

public class Test {

   // method to check if each number is prime
   public static boolean isPrime(int x) {
      for (int i = 2; i < x; i++)
         if (x % i == 0) {
            return false;
         }
      return true;
   }

   public static void main(String[] args) {
      Scanner scanner = new Scanner(System.in);

      System.out.println("Enter a number");
      int num = scanner.nextInt();

      // print out 2 as we wont be checking even numbers.
      System.out.println(2);

      // iterate till user input
      for (int i = 3; i < num; i = i + 2) {
        if (isPrime(i)) {
          System.out.println(i);
        }
      }
   }
}

打印从2到输入数字的素数，并避免使用“ n / 2”逻辑

1 个答案: