Question

import java.util.Scanner;
public class bankcounter {
  public static void main(String []args) {
  int numchecks;
  double totalfeeforchecks;
  double totalfee;
  double totalbasecharge;
  double bankfee;
  Scanner in = new Scanner(System.in);
  System.out.printf("Enter in the amount of checks you wish to use: ");
  numchecks = in.nextInt();
  totalbasecharge = 20.00;
  bankfee = 10.00;
  totalfeeforchecks = 0;
  if(numchecks > 0 && numchecks < 20)
        {
        totalfeeforchecks += (numchecks * .10);
        }
  else 
        {
        totalfeeforchecks += (19 * .10);
        numchecks -= 19;
        }
        if(numchecks > 0 && numchecks <= 20) 
            {
            totalfeeforchecks += (numchecks * .08);
            }
        else
            {
            totalfeeforchecks += (20 * .08);
            numchecks -= 20;
            }
            if(numchecks > 0 && numchecks <= 20)
                {
                totalfeeforchecks += (numchecks * .06);
                }
            else
                {
                totalfeeforchecks += (20 * .06);
                numchecks -= 20;
                }
                if(numchecks > 0 && numchecks <= 20)
                    {
                    totalfeeforchecks += (20 * .04);
                    numchecks -= 20;
                    }
                else
                    {
                    totalfeeforchecks += (numchecks * .04); 
                    }
totalfee = totalfeeforchecks + totalbasecharge + bankfee;
System.out.printf("Based on our check fee schedule: .10 cents for less than 20 checks :: .08 cents for 20-39 checks :: .06 cents for 40 to 59 checks :: .04 cents each for 60 or more checks\n\nYour charges are as follows: \nTotal fee = %.2f \n\tTotal base charge = \t%.2f\n\tTotal bank fee = \t%.2f\n\tTotal fee for checks = \t%.2f", totalfee, totalbasecharge, bankfee, totalfeeforchecks);

因此，如果我为numchecks输入9，则支票的总费用应该只有.90，而不是2.96。我的if语句不起作用吗？我想如果我把9放在numchecks上，它应该只运行超过第一个条件，因为我嵌套了其余的......帮助？

Answer 1

我建议您使用IDE中的工具，例如格式化程序和调试程序。使用这些工具，您会看到此行有四次

if(numchecks > 0 && numchecks <= 20)

这是正确的四次，所以代替if不工作，事实上工作比你想象的更多。

这意味着您正在运行

totalfeeforchecks += (numchecks * .10); // 0.9
totalfeeforchecks += (numchecks * .08); // 0.72
totalfeeforchecks += (numchecks * .06); // 0.54
totalfeeforchecks += (20 * .04); // 0.8
// total is 2.96

Answer 2

让我为您修复缩进，而不实际更改代码：

import java.util.Scanner;
public class bankcounter {
  public static void main(String []args) {
  int numchecks;
  double totalfeeforchecks;
  double totalfee;
  double totalbasecharge;
  double bankfee;
  Scanner in = new Scanner(System.in);
  System.out.printf("Enter in the amount of checks you wish to use: ");
  numchecks = in.nextInt();
  totalbasecharge = 20.00;
  bankfee = 10.00;
  totalfeeforchecks = 0;

  if(numchecks > 0 && numchecks < 20)
  {
        totalfeeforchecks += (numchecks * .10);
  }
  else 
  {
        totalfeeforchecks += (19 * .10);
        numchecks -= 19;
  }

  if(numchecks > 0 && numchecks <= 20) 
  {
        totalfeeforchecks += (numchecks * .08);
  }
  else
  {
        totalfeeforchecks += (20 * .08);
        numchecks -= 20;
  }

  if(numchecks > 0 && numchecks <= 20)
  {
        totalfeeforchecks += (numchecks * .06);
  }
  else
  {
        totalfeeforchecks += (20 * .06);
        numchecks -= 20;
  }

  if(numchecks > 0 && numchecks <= 20)
  {
        totalfeeforchecks += (20 * .04);
        numchecks -= 20;
  }
  else
  {
        totalfeeforchecks += (numchecks * .04); 
  }

  totalfee = totalfeeforchecks + totalbasecharge + bankfee;

原因现在应该是显而易见的。

我从if语句中得到了一个完全出乎意料的结果？

2 个答案: