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我的程序中有一個輸出出現問題。這個問題源於我的一個輸出繞過了另一個do/while循環內的嵌套do/while循環。我可以把第一個輸出語句放在嵌套的do/while循環中。這樣做的問題是它會給我兩個輸出消息，而不是基於我的計算。不幸的是，由於一切都是主要的，因此該計劃有點長。Do/While循環輸出時出現問題
import java.util.Scanner; //CAPTURES USERS INPUT VIA THE KEYBOARD
public class practice
{
public practice()
{
}
public static void main(String[] args)
{
char response = 0; //STORES USERS RESPONSE
int attempt = 1; //LOOP CONTROL VARIABLE FOR OUTER DO WHILE LOOP
int attempts = 1; //LOOP CONTROL VARIABLE FOR INNER DO WHILE LOOP
double grossAnnualIncome = 0.0; //STORES USERS GROSS ANNUAL INCOME
double annualTuition = 0.0; //STORES USERS ANNUAL TUITION PAYMENTS
double annualCharity = 0.0; //STORES USERS ANNUAL DONATIONS TO CHARITY
double homeMortgage = 0.0; //STORES USERS ANNUAL HOME MORTGAGE PAYMENTS
double healthCredit = 0.0; //STORES USERS HEALTH INSURANCE CREDIT
double annualAfterTaxes = 0.0; //STORES USERS ANNUAL INCOME AFTER TAXES
double monthlyAfterTaxes = 0.0; //STORES USERS MONTHLY INCOME AFTER TAXES
double taxOwed = 0.0; //STORES USERS TAX RATE AT A FIXED RATE OF 17%
double taxableIncome = 0.0; //STORES USERS TAXABLE INCOME
double taxCredits = 0.0; //STORES ALL OF THE USERS TAX CREDITS ADDED TOGETHER
Scanner input = new Scanner(System.in); //ALLOWS THE USER TO ENTER THEIR CURRENT TAX INFORMATION
do
{
do
{
System.out.print("\nPlease enter your gross annual income or 0 for none: "); //PROMPT 1
grossAnnualIncome = input.nextDouble();
if(grossAnnualIncome > 0)
{
System.out.print("\nPlease enter your annual tuition and expenses for higher education or 0 for none: ");
annualTuition = input.nextDouble();
System.out.print("\nPlease enter your annual charitable contributions or 0 for none: ");
annualCharity = input.nextDouble();
System.out.print("\nPlease enter the annual interest paid for your home mortgage or 0 for none: ");
homeMortgage = input.nextDouble();
input.nextLine();
System.out.print("\nDid you purchase health insurance through your employer or outside the workplace?"
+ " Enter 'Y' or 'N': ");
response = input.nextLine().charAt(0);
if(Character.toUpperCase(response) == 'Y')
{
System.out.print("\nAre you filing as a family? Enter 'Y' or 'N': "); //PROMPT 6
response = input.nextLine().charAt(0);
if (Character.toUpperCase(response) == 'Y')
{
healthCredit = 3500;
}
else
{
if(Character.toUpperCase(response) == 'N')
{
System.out.print("\nAre you filing as single? Enter 'Y' or 'N': "); //PROMPT 7
response = input.nextLine().charAt(0);
}
if(Character.toUpperCase(response) == 'Y')
{
healthCredit = 2000;
}
}
}
else
{
healthCredit = 0;
}
System.out.printf("\nAre the following entries correct?\n\n"
+ "Gross Annual Income: $%,.0f\n\n"
+ "Deductions: \n"
+ "\tHigher Education: %,.0f\n"
+ "\tCharitable Contributions: %,.0f\n"
+ "\tHome Mortgage Interest: %,.0f\n"
+ "\tHealth Insurance Tax Credit: %,.0f\n\n", grossAnnualIncome, annualTuition, annualCharity, homeMortgage, healthCredit);
System.out.print("\nEnter 'Y' or 'N': ");
response = input.nextLine().charAt(0);
}
if(Character.toUpperCase(response) == 'Y')
{
--attempts;
}
}while(attempts == 1);
//CALCULATIONS
taxableIncome = grossAnnualIncome - taxCredits;
taxOwed = taxableIncome * .17; //TAKES TAXABLE INCOME AND MULTIPLIES IT BY A 17% FLAT TAX RATE
annualAfterTaxes = grossAnnualIncome - taxOwed; //TAKES USERS GROSS ANNUAL INCOME SUBTRACTED BY 17% TAX BRACKET
monthlyAfterTaxes = annualAfterTaxes/12; //DIVIDES THE USERS ANNUAL GROSS AFTER TAXES BY 12 FOR MONTHLY GROSS
taxCredits = annualTuition + annualCharity + homeMortgage + healthCredit; //ADDS UP THE USERS TOTAL ANNUAL TAX
if(grossAnnualIncome == 0)
{
System.out.print("\nYou earned no income so you owe no taxes!"); //GROSS ANNUAL INCOME EQUALS ZERO OUTPUT
input.nextLine();
}
else if(grossAnnualIncome <= taxCredits)
{
System.out.print("\nYOU OWE $0.00 IN TAXES!"); //GROSS ANNUAL INCOME LESS THAN OR EQUAL TO TAX CREDITS OUTPUT
}
else
{
//GROSS ANNUAL INCOME GREATER THAN ZERO OUTPUT
System.out.printf("\n\nYOUR TAXES\n\n"
+ "Gross Annual Income: $%,.0f\n\n"
+ "Deductions: \n"
+ "\tHigher Education: %,.0f\n"
+ "\tCharitable Contributions: %,.0f\n"
+ "\tHome Mortgage Interest: %,.0f\n"
+ "\tHealth Insurance Tax Credit: %,.0f\n\n"
+ "Tax at 17%%: $%,.0f\n"
+ "Annual Income After Tax: $%,.0f\n"
+ "Monthly Income After Tax: $%,.0f", grossAnnualIncome, annualTuition, annualCharity,
homeMortgage, healthCredit, taxOwed, annualAfterTaxes, monthlyAfterTaxes);
}
System.out.print("\n\nDo you want to calculate taxes for someone else? Enter 'Y' or 'N' ");
response = input.nextLine().charAt(0);
if(Character.toUpperCase(response) == 'N')
{
--attempt;
}
}while(attempt == 1);
System.exit(0);
}
}
再一次，我很抱歉代碼是多久。我有確切的問題是，當用戶在第一次提示進入0（不進入嵌套的do/while循環），它只是循環：
Please enter your gross annual income or 0 for none: 0
Please enter your gross annual income or 0 for none: 0
Please enter your gross annual income or 0 for none: 0
現在，如果我動議：
if(grossAnnualIncome == 0)
{
System.out.print("\nYou earned no income so you owe no taxes!");
input.nextLine();
break;
}
進入嵌套do/while循環我得到：
Please enter your gross annual income or 0 for none: 0
You earned no income so you owe no taxes!
YOU OWE $0.00 IN TAXES!
它應該只讀取第一個輸出。
正確的輸出應該是這樣的：
Please enter your gross annual income or 0 for none: 0
You earned no income so you owe no taxes!
預先感謝您。
我現在沒有機會將其插入編譯器，但嘗試將'attempt'和'attempts'的默認值更改爲'0'而不是'1'。 – edthethird 2012-03-23 03:11:20
嗯，它修復了一件事，搞砸了另一件事。我認爲這是正確的道路。可能需要稍微調整一下邏輯。 – Abweichung 2012-03-23 03:25:55