需要帮助获取来自不同类别的物品的平均重量

Question

我被作业的最后一部分卡住了，只是不知道如何完成它。

我的任务是取3个权重（以磅和盎司为单位）并获得平均权重，然后将其打印到命令行。我目前的想法是将所有三个权重相加，然后我认为将它们除以3就很容易了。但是当我尝试这样做时，它会抛出一个错误，说“二进制运算符'/'的坏操作数类型”

我有两个单独的文件。

“”

// a class that represents a Weight in pounds and ounces

class Weight {
  // private instant variables
  private int pounds;
  private double ounces;
  // private constant variable
  private static double OUNCES_IN_A_POUND = 16;
  

    // a method that normalizes the weight on which it was invoked
  private void normalize() {
    // while loop used to continusoulsy loop til less than 16 ounces
    while(ounces > OUNCES_IN_A_POUND) {
      // decrement 16 ounces from the ounces and increment pound by 1
      ounces -= OUNCES_IN_A_POUND;
      pounds++;
    }
  }


// method used to return total number of ounces
  private double toOunces() {
    return pounds * OUNCES_IN_A_POUND + ounces;
  }


  // constructor for pounds and ounces to be initialized
  public Weight(int pounds, double ounces) {
    this.pounds = pounds;
    this.ounces = ounces;
    // normalize the ounces
    normalize();
  }


  // a method that checks if the current object's weight is less than
  public boolean lessThan(Weight wt) {
    if(this.pounds < wt.pounds)
      return true;
    else if(this.pounds > wt.pounds)
      return false;
    else {
      if(this.ounces < wt.ounces)
        return true;
      else
        return false;
    }
  }  
  
// a method that adds weight to the current object

  public void addTo(Weight wt) {
    this.pounds += wt.pounds;
    this.ounces += wt.ounces;
    normalize();
  }

  
// a method that returns the string 
  public String toString() {
    return pounds + " pounds " + String.format("%.2f", ounces) + " ounces";
  }

}

第二个文件：

class Project1 {

  // a method that returns the smallest weight among 3 weights
  private static Weight findMinimum(Weight w1, Weight w2, Weight w3) {
    // if the first weight is smaller than the second & third weight
    Weight minimum;    
    if(w1.lessThan(w2) && w1.lessThan(w3)){

      // return the first weight as the smallest weight
        minimum = w1;
        }
    // else if the second weight is smaller than the first & third weight
    else if (w2.lessThan(w1) && w2.lessThan(w3)){
      // return the second weight as the smallest weight
        minimum = w2;
        }
    // else the third weight is smaller than the first & second weight
    else{
        // return the third weight as the smallest weight
        minimum = w3;
        }
    System.out.println("\nThe minimum weight is " + minimum.toString());
    return minimum;
  }

  // a method that returns the highest weight among 3 weights

  private static Weight findMaximum(Weight w1, Weight w2, Weight w3) {
    // if the first weight is greater than the second & third weight
    Weight maximum;
    if (!w1.lessThan(w2) && !w1.lessThan(w3)){
      // return the first weight as the highest weight
      maximum = w1;
    }
    // else if the second weight is greater than the first & third weight
    else if (!w2.lessThan(w1) && !w2.lessThan(w3)){
      // return the second weight as the highest weight
      maximum = w2;
    }
    // else the third weight is greater than the first & second weight
    else{
      // return the third weight as the highest weight
      maximum = w3;
    }  
    System.out.println("\nThe maximum weight is " + maximum.toString());
    return maximum;
  }

  // a method that returns the average weight among 3 weights

    private static Weight findAverage(Weight w1, Weight w2, Weight w3) {
    // create a new Weight object
    Weight average = new Weight(0, 0);
    // add the weight of the three objects to the new Weight object
    // by invoking the addTo() method
    average.addTo(w1);
    average.addTo(w2);
    average.addTo(w3);
    average = average / 3;
    
 

    System.out.println("\nThe average weight is " + average.toString());
    return average;
  }

  
  
  // main method

  public static void main(String[] args) {
    // create three weight objects
    Weight weight1 = new Weight(25, 20);
    Weight weight2 = new Weight(30, 8);
    Weight weight3 = new Weight(23, 10);
    // display the 3 weights
    System.out.println("Weight 1: " + weight1.toString());
    System.out.println("Weight 2: " + weight2.toString());
    System.out.println("Weight 3: " + weight3.toString());
    // invoke the findMinimum() method to get the smallest weight among the 3
    // weights
    // display the minimum of the 3 weights
    Weight min = findMinimum(weight1, weight2, weight3);

    //findMinimum;
    // invoke the findMaximum() method to get the highest weight among the 3 weights
    Weight max = findMaximum(weight1, weight2, weight3);

    Weight avg = findAverage(weight1,weight2, weight3);


  }

}

第二个文件是我需要帮助的地方。在findAverage方法中。

Answer 1

由于这是家庭作业，我不会马上给你答案，因为它确实违背了家庭作业的目的。但是，我相信向您指出正确的方向会有所帮助。话虽如此，也许您可以尝试使用带有for循环的数组。for循环可用于查找总数，然后您可以通过数组的大小获得数字的数量。然后您可以执行数组的总数/大小以获得平均值。我希望这有帮助！