缺乏条件声明

Question

package e.power.bhd;

import java.util.Scanner;

公共类EPowerBhd {

public static void main(String[] args) {
    int accountNum = 1;
    double cMeter;
    double pMeter;
    double eUsage;
    double totalDueAmount = 0.0;
    double Tot = 0.0;
    Scanner input = new Scanner(System.in);

        while (accountNum != 0) {

            // user enter account no
            System.out.print("Enter Account number (0 to stop ) : ");
            accountNum = input.nextInt();
            // user enter current meter reading
            System.out.print("Current meter reading : ");
            cMeter = input.nextDouble();
            // user enter previous meter reading
            System.out.print("Previous meter reading : ");
            pMeter = input.nextDouble();
            eUsage = cMeter - pMeter;
            System.out.print("Electricity Usage(in kWh) : " + eUsage);
            System.out.println();

            if (eUsage >= 1 && eUsage <= 200) {
                totalDueAmount = 0.218 * eUsage;
            } else if (eUsage > 200 && eUsage <= 300) {
                totalDueAmount = 0.334 * eUsage;
            } else if (eUsage > 300 && eUsage <= 600) {
                totalDueAmount = 0.516 * eUsage;
            } else if (eUsage > 600 && eUsage <= 900) {
                totalDueAmount = 0.546 * eUsage;
            } else {
                totalDueAmount = 0.571 * eUsage;
            }
            System.out.println();  // total amount for the account is displayed
            System.out.println("Amount number : " + accountNum + "," + " your charge is " + "RM" + totalDueAmount);
            Tot = totalDueAmount++;
            System.out.println();

        } // loop exit and displa the total amount for all accounts
        System.out.println("Total Amount collected  = " + "RM" + Tot);
        System.out.println("________________________________");
        System.out.println("--- DONE ----");
        System.out.println("________________________________");

    }

}

我已经完成了一个java程序，用户输入帐号，当前抄表和以前的当前读数，然后计算电力usag 它将计算帐户的用电量，直到用户输入0结束循环，并计算并显示所有帐户的总金额。

在此程序中，如果用户首先输入0，则应显示＆＃34;未处理任何帐户。＆＃34;只有并终止。

附上程序代码和程序的详细信息。

https://www.dropbox.com/s/85mm1w09tl7c1n3/1.png?dl=0 https://www.dropbox.com/s/8w0ngjt9em70q7w/2.png?dl=0

任何帮助主要是赞赏..

Answer 1

有两种方法可以做到。

使用continue关键字。请看下面。

while (accountNum != 0) {
    // user enter account no
    System.out.print("Enter Account number (0 to stop ) : ");
    accountNum = input.nextInt()
    if(accountNum==0){
         continue;
    }
    // user enter current meter reading
    System.out.print("Current meter reading : ");
    cMeter = input.nextDouble();

//rest of your code

使用//rest of your code
```
Sytem.exit(-1)
```

Answer 2

缺乏条件声明

你的程序中的错误的答案是它是一个永无止境的循环。它始终是真实的，因为您刚刚询问accountNum的值并且没有添加条件语句。

使用以下代码替代您的代码，它可以正常运行。

import java.util.Scanner;

public class Yehey {
    public static void main(String[] args) {
        int accountNum = 1;
        double cMeter;
        double pMeter;
        double eUsage;
        double totalDueAmount = 0.0;
        double Tot = 0.0;
        Scanner input = new Scanner(System.in);

        while (true) {

            // user enter account no
            System.out.print("Enter Account number (0 to stop ) : ");
            accountNum = input.nextInt();
            if (accountNum==1) {
                // user enter current meter reading
                System.out.print("Current meter reading : ");
                cMeter = input.nextDouble();
                // user enter previous meter reading
                System.out.print("Previous meter reading : ");
                pMeter = input.nextDouble();
                eUsage = cMeter - pMeter;
                System.out.print("Electricity Usage(in kWh) : " + eUsage);
                System.out.println();

                if (eUsage >= 1 && eUsage <= 200) {
                    totalDueAmount = 0.218 * eUsage;
                } else if (eUsage > 200 && eUsage <= 300) {
                    totalDueAmount = 0.334 * eUsage;
                } else if (eUsage > 300 && eUsage <= 600) {
                    totalDueAmount = 0.516 * eUsage;
                } else if (eUsage > 600 && eUsage <= 900) {
                    totalDueAmount = 0.546 * eUsage;
                } else {
                    totalDueAmount = 0.571 * eUsage;
                }
                System.out.println();  // total amount for the account is displayed
                System.out.println("Amount number : " + accountNum + "," + " your charge is " + "RM" + totalDueAmount);
                Tot = totalDueAmount++;
                System.out.println();

                // loop exit and displa the total amount for all accounts
                System.out.println("Total Amount collected  = " + "RM" + Tot);
                System.out.println("________________________________");
                System.out.println("--- DONE ----");
                System.out.println("________________________________");
            } else {
                System.out.println("Thank you for using my program.");
                break;
            }
        }
    }
}

添加了更改：
1.将while的内部条件更改为true
2.如果accountNum保持为1，则添加if语句以执行代码，如果程序的值更改为其他值，则断开程序 3.如果accountNum的值不等于零，则添加... System.out.println("Thank you for using my program."); break;

（注意：请澄清您的问题或疑问，以避免标记您的问题或减少投票。）

简单的Java错误

2 个答案:

缺乏条件声明