Question

仅使用while循环我需要一个程序读取2个整数n，m（n <= m）并打印n和m之间的所有偶数（包括）。例如，如果输入值为2和9，则输出必须是2 4 6 8.或者对于输入3和12，程序必须产生4 6 8 10 12。

这是我想象的，但它不起作用！

请帮助!!!!

    Scanner input = new Scanner(System.in);
    System.out.print("Enter an integer value-> ");
    int k = input.nextInt();
    input = new Scanner(System.in);
    System.out.print("Enter a larger value-> ");
    int j = input.nextInt();
    int i = 1;

    while (i >= k) {
      System.out.println(i); 
      i = i + 2;
      System.out.println(i);
      if (i < j) {
        i = i + 2;
        System.out.println(i);
      }
    }

Answer 1

Scanner input = new Scanner(System.in);
System.out.print("Enter an integer value-> ");
int k = input.nextInt();
input = new Scanner(System.in);
System.out.print("Enter a larger value-> ");
int j = input.nextInt();
int i = k;
if(i % 2 == 1)
    i++;

while (i <= j) {
    System.out.println(i); 
    i = i + 2;
}

Answer 2

试试这个，我修改了int i = k，而循环条件i < = j＆amp;为偶数增加了逻辑

    Scanner input = new Scanner(System.in);
    System.out.print("Enter an integer value-> ");
    int k = input.nextInt();
    input = new Scanner(System.in);
    System.out.print("Enter a larger value-> ");
    int j = input.nextInt();
    int i = k;

    while (i <= j) {
       if (i%2 == 0) {
           System.out.println(i);
       }
       i++;
    }

Answer 3

我是用for做的，但也许我已经晚了lol

Scanner input = new Scanner(System.in);
System.out.print("Enter an integer value-> ");
int k = input.nextInt();

System.out.print("Enter a larger value-> ");
int j = input.nextInt();

for (int i=k;i<=j; i++){
        if (i%2 == 0){
        System.out.println(i);
        } 
}

Answer 4

这是我的解决方案，有一些帮助，所以你可以学习

Scanner input = new Scanner(System.in);
System.out.print("Enter an integer value-> ");
int k = input.nextInt();
// >> input = new Scanner(System.in); do not need this line
System.out.print("Enter a larger value-> ");
int j = input.nextInt();
// int i = 1; you do not need extra value you can reuse k

if ( k % 2 != 0){ // number is odd
   ++k
}

while(k < j) {
  System.out.println("" + k);
  k += 2;
}

我需要一个程序读取2个整数n，m（n <= m）并打印n和m之间的所有偶数（包括）。

4 个答案: