执行程序时，额外的输入命令会导致逻辑错误java

Question

我正在尝试执行一个称为AverageRainfall的程序。 大部分输入都能很好地工作（开头的my while语句很好），但是变量monthRain下有多个月份，monthRain的while语句在各个月份中均不起作用，只有初始输入命令在起作用没有目的

ETA：发布整个代码以进行测试

  import java.util.Scanner; //for Scanner class

  public class AverageRainfall
  {
  public static void main(String[] args)
  {
     final int NUM_MONTHS = 12;     //Months per year
     int years;                     //Number of years
     double monthRain;                  //Rain for a month
     double totalRain = 0;              //Rainfall accumulator
     double average;                    //Average rainfall

     Scanner keyboard = new Scanner(System.in);

     {
     System.out.print("Enter the number of years: ");
     years = keyboard.nextInt();

     while (years < 1)
        {
        System.out.print("Invalid. Enter 1 or greater: ");
        years = keyboard.nextInt();
        }
     }

      { 
         System.out.println("Enter the rainfall, in inches, for each month. ");
         monthRain = keyboard.nextDouble();

         for(int y = 1; y <= years; y++){

           for(int m = 1; m <= NUM_MONTHS; m++){

       System.out.print("Year" + y + "month" + m + ": ");
       monthRain = keyboard.nextDouble(); 
       }
       }
       while (monthRain < 0)
      {
         System.out.print("Invalid. Enter 0 or greater: ");
         monthRain = keyboard.nextDouble();
      }
      }  

       {
        totalRain += monthRain;

        average = totalRain / (years * NUM_MONTHS);

        System.out.println("\nNumber of months: " + (years * NUM_MONTHS) );
        System.out.println("Total rainfall: " + totalRain + " inches");
        System.out.println("Average monthly rainfall: " + average + " inches");
       }
    }
}

这是完整的代码。

Answer 1

您可以做的是在用户每次输入一个月的降雨时将其添加到降雨总数中。 然后，当他完成数据输入后，便可以进行平均。

`import java.util.Scanner; 公开课测试{

public static void main(String[]args){
    double monthRain=0;
    double totalRain=0;
    Scanner keyboard = new Scanner(System.in);
    int years = 1;
    int NUM_MONTHS = 12;
    System.out.println("Enter the rainfall, in inches, for each month. ");
    for(int y = 1; y <= years; y++){
        for(int m = 1; m <= NUM_MONTHS; m++){

            System.out.print("Year" + y + "month" + m + ": ");
            monthRain = keyboard.nextDouble(); 
            totalRain+=monthRain;
        }
    }
    int totalMonth = years*NUM_MONTHS;
    System.out.println("\nNumber of months: " + totalMonth );
    System.out.println("Total Rain: "+totalRain+" inches");
    double average = totalRain / totalMonth;
    System.out.println("Average monthly rainfall: " + average + " inches");

}

}`

Answer 2

您正在使用不必要的括号。 此外，您的代码中还存在一些逻辑缺陷。 我已经修复了您的代码。 请参考以下代码：

import java.util.Scanner; //for Scanner class

public class AverageRainfall {
 public static void main(String[] args) {
    final int NUM_MONTHS = 12; // Months per year
    int years; // Number of years
    double monthRain=0; // Rain for a month
    double totalRain = 0; // Rainfall accumulator
    double average; // Average rainfall

    Scanner keyboard = new Scanner(System.in);

    System.out.print("Enter the number of years: ");
    years = keyboard.nextInt();

    while (years < 1) {
        System.out.print("Invalid. Enter 1 or greater: ");
        years = keyboard.nextInt();

    }


    System.out.println("Enter the rainfall, in inches, for each month. ");
    for (int y = 1; y <= years; y++) {

        for (int m = 1; m <= NUM_MONTHS; m++) {

            System.out.print("Year" + y + "month" + m + ": ");
            monthRain = keyboard.nextDouble();

            while (monthRain < 0) {
                System.out.print("Invalid. Enter 0 or greater: ");
                monthRain = keyboard.nextDouble();
            }
            totalRain += monthRain;
        }   
    }   





    average = totalRain / (years * NUM_MONTHS);

    System.out.println("\nNumber of months: " + (years * NUM_MONTHS));
    System.out.println("Total rainfall: " + totalRain + " inches");
    System.out.println("Average monthly rainfall: " + average
                + " inches");

 }
}