Question

基本上，我应该写的程序是从客户获得12个月的能源使用量，然后输出总使用量，两个关税的价格（公式包含在代码中）并说明哪个关税更便宜。但它还必须检查这12个月中每一个的输入是否在该范围内（大于“0”且小于或等于“1000”）。我已经找到了一种使用数组的相当简单（？）的方法，但是我不知道如何检查扫描到该数组中的每个整数是否实际上在0 <范围内。 int＆lt; = 1000

如果整数小于0或大于1000，程序必须输出一行“请输入有效金额”并再次询问相同的整数，以便它不会存储错误的值，如果它有意义吗？

import java.util.Scanner;

public class EnergyConsumptionExample {

    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);

        int total_usage;
        float t1_cost, t2_cost;
        final int MAX_USAGE = 1000, MIN_USAGE = 0;

        int[] energyCons = new int[12];

        for (int month = 0; month < energyCons.length; month++) {
            System.out.print("Please enter the monthly kWh usage for month ");
            System.out.print((month + 1) + ": ");
            energyCons[month] = scan.nextInt();
        }

        int totalCons = 0;
        for (int month = 0; month < energyCons.length; month++) {
            totalCons += energyCons[month];
        }

        System.out.println();
        System.out.println("Total usage for the year was " + totalCons + " kWh");

        t1_cost = (float) (totalCons * 0.1);
        t2_cost = (float) ((totalCons * 0.09) + 50);

        System.out.println("Using tariff one, the cost is: " + t1_cost);
        System.out.println("Using tariff two, the cost is: " + t2_cost);
        System.out.println();

        if (t1_cost > t2_cost) {
            System.out.println("Tariff two would be cheaper for this customer.");
        } else {
            System.out.println("Tariff one would be cheaper for this customer.");
        }

    }
}

Answer 1

将输入阅读循环更改为：

for (int month = 0; month < energyCons.length; month++) {
  System.out.print("Please enter the monthly kWh usage for month ");
  System.out.print((month + 1) + ": ");
  int inputValue = scan.nextInt();
  while (inputValue < 0 || inputValue > 1000) {
    System.out.println("Please enter a valid amount: ");
    inputValue = scan.nextInt();
  }
  energyCons[month] = inputValue;
}

检查数组中的整数是否在范围内

1 个答案: