Question

过去两个小时左右我一直在研究这个问题而且遇到了障碍。我实际上可以执行除法，但是当需要打印非0的余数时输出不匹配。我想知道我做错了什么。

public class Division {
   public static void main(String[] args) {
      int numerator = 0;
      int numeratorprint = 0;       
      int denominator = 0;
      int product = 0;
      int remainder = 0;
      int counter = 1;

      Scanner input;
      input = new Scanner(System.in);
      System.out.print("Enter two positive intergers for division:\n");
      numerator = input.nextInt();
      numeratorprint = numerator;
      denominator = input.nextInt();

      while ((numerator < 0) || (denominator < 0)) {
         System.out.print("Enter two positive intergers for division:\n");
         numerator = input.nextInt();
         denominator = input.nextInt();
      }
      if (numerator == 0){
      System.out.print(numerator + "/" + denominator + " = " + numerator + " with a remainder of " + numerator);
      }
      else if (denominator == 0){
          System.out.print("This result is undefined (Cannot divide by Zero)");
      }
      else if (denominator > numerator){
        System.out.print("Cannot do proper fractions");
      }
      else {
         while (numerator > denominator){
              counter++;
              numerator = numerator - denominator;
              }
      }
      product = counter * denominator;
      remainder = numeratorprint - product;
      System.out.println(numeratorprint + " / " + denominator + " = " + counter + " with a remainder of " + remainder);
   }
}

/* Sample I/O 1 
Enter two positive intergers for division:
25
5
OUTPUT:
25 / 5 = 5 with a remainder of 0

Sample I/O 2
Enter two positive intergers for division:
27
5
OUTPUT: 
27 / 5 = 6 with a remainder of -3
*/

Answer 1

我相信你有一个错误，你在1而不是0开始你的计数器。我测试了一些数字，改变这似乎解决它就好了。所以改变

int counter = 1;

到

int counter = 0;

此外，您必须将else块的条件更改为

while (numerator >= denominator) {...

以说明除数何时均分红利的情况。

Answer 2

我在代码中看到了一些错误。 1.冗余变量 2为什么不使用模块化操作员？ 3.你也可以删除一个while循环

rails generate migration AddTypeDeliveryToProducts type_delivery:integer

class AddTypeDeliveryToProducts < ActiveRecord::Migration[5.1]
  def change
    add_column :products, :type_delivery, :integer, array:true, default: [], limit: 8
  end
end

class Product < ApplicationRecord
  enum type_delivery: { a: 1, b: 2, c: 3, d: 4 }
end

没有除法和模运算符的商和余数

2 个答案: