Question

in java: In my code at have my last two methods that I cannot exactly figure out how to execute. I have too convert a Roman number to its decimal form for the case 3 switch. The two methods I cannot figure out are the public static int valueOf(int numeral) and public static int convertRomanNumber(int total, int length, String numeral). This is what my code looks like so far:

public static void main(String[] args) {

// TODO Auto-generated method stub

Scanner in = new Scanner(System.in);

String fName = "";

String lName = "";

double hoursWorked = 10;

double hourlyRate = 10;

double regularPay = 10;

double overtimeHours = 10;

int choice;

System.out.println("Calculator Menu");

System.out.println("1) Wage Calculator");

System.out.println("2) Coupon Calculator");

System.out.println("3) Roman Number Converter");

System.out.println("4) Exit");

System.out.println("");

System.out.println("Enter choice: ");

choice = in.nextInt();

switch(choice) {

case 1:

System.out.println("Enter first name: ");

fName = in.next();

System.out.println("Enter last name: ");

lName = in.next();

System.out.println("Enter hourly rate: ");

hourlyRate = in.nextDouble();

System.out.println("Enter hours worked: ");

hoursWorked = in.nextDouble();

System.out.printf("Name: " + fName + "," + lName);

System.out.println("");

wageCalculator(hoursWorked, overtimeHours, hourlyRate, regularPay);

break;

case 2:

double purchaseAmount;

int purchaseType;

final double autoP = 1;

final double frag = 2;

final double acc = 3;

System.out.println("Enter purchase amount: ");

purchaseAmount = in.nextDouble(); {

System.out.println("Choose purchase type: ");

System.out.println("1) Auto Parts");

System.out.println("2) Fragrances");

System.out.println("3) Accessories");

purchaseType = in.nextInt();

}

couponCalculator(purchaseType, purchaseAmount, autoP, frag, acc);

break;

case 3:

double calc_w;

/*

int length = Integer.toString(numeral).length();

System.out.println("Please enter Roman Number: ");

*/ String numeral = null;

int total = 0;

int length = numeral.length();

System.out.print("Enter roman numeral to convert: ");

numeral =in.next();

// total = convertNum(romanNum);

System.out.println("The roman numeral converted is: " + total);

total = in.nextInt();

// Method valueOf - Gives the value of the Roman numeral @param numeral a single Roman numeral

// @return the decimal value of numeral

//promp user to enter roman number

// then convert it to regular number

convertRomanNumber(total, length, numeral);

break;

case 4:

// exit program

System.out.println("Thank you for using our program. Have a great day!");

}

}

public static void wageCalculator(double hoursWorked, double overtimeHours, double hourlyRate, double regularPay) {

// TODO Auto-generated method stub

double overtimePay = 0;

if (hoursWorked > 40) {

overtimeHours = hoursWorked - 40;

System.out.println("Overtime hours: " + overtimeHours);

overtimePay = overtimeHours*(1.5*hourlyRate);

System.out.println("Overtime Pay: " + overtimePay);

System.out.printf("Total Pay $%.2f", regularPay + overtimePay);

hoursWorked = 40;

}

regularPay = hourlyRate*hoursWorked;

System.out.println("Regular hours worked: " + hoursWorked);

System.out.println("Regular Pay: $" + regularPay);

System.out.printf("Total Pay $%.2f", regularPay + overtimePay);

}

// add all variables to method header

public static void couponCalculator(int purchaseType, double purchaseAmount, double autoP, double frag, double acc) {

if (purchaseType == autoP) {

System.out.println("Your coupon is: $" + purchaseAmount*.10 + "(Auto Parts)");

} if (purchaseType == frag) {

System.out.println("Your coupon is: $" + purchaseAmount*.15 + "(Fragrances)");

} if (purchaseType == acc) {

System.out.println("Your coupon is: $" + purchaseAmount*.20 + "(Accessories)");

}

}

public static int convertRomanNumber(String str) {

}

return total;

}

public static int valueOf(char numeral) {

if (numeral == 'I') {

return 1;

}

if (numeral == 'V') {

return 5;

} if (numeral == 'X') {

return 10;

} if (numeral == 'L') {

return 50;

} if (numeral == 'C') {

return 100;

} if

(numeral == 'D')

return 500;

else if (numeral == 'M')

return 1000;

return numeral;

}

}

Answer 1

Implementation:

   public static void main(String[] args) {
        // TODO code application logic here
       

// TODO Auto-generated method stub

Scanner in = new Scanner(System.in);

String fName = "";

String lName = "";

double hoursWorked = 10;

double hourlyRate = 10;

double regularPay = 10;

double overtimeHours = 10;

int choice;

System.out.println("Calculator Menu");

System.out.println("1) Wage Calculator");

System.out.println("2) Coupon Calculator");

System.out.println("3) Roman Number Converter");

System.out.println("4) Exit");

System.out.println("");

System.out.println("Enter choice: ");

choice = in.nextInt();

switch(choice) {

case 1:

System.out.println("Enter first name: ");

fName = in.next();

System.out.println("Enter last name: ");

lName = in.next();

System.out.println("Enter hourly rate: ");

hourlyRate = in.nextDouble();

System.out.println("Enter hours worked: ");

hoursWorked = in.nextDouble();

System.out.printf("Name: " + fName + "," + lName);

System.out.println("");

wageCalculator(hoursWorked, overtimeHours, hourlyRate, regularPay);

break;

case 2:

double purchaseAmount;

int purchaseType;

final double autoP = 1;

final double frag = 2;

final double acc = 3;

System.out.println("Enter purchase amount: ");

purchaseAmount = in.nextDouble(); {

System.out.println("Choose purchase type: ");

System.out.println("1) Auto Parts");

System.out.println("2) Fragrances");

System.out.println("3) Accessories");

purchaseType = in.nextInt();

}

couponCalculator(purchaseType, purchaseAmount, autoP, frag, acc);

break;

case 3:

double calc_w;

/*

int length = Integer.toString(numeral).length();

System.out.println("Please enter Roman Number: ");

*/ 
String numeral;

int total = 0;



System.out.print("Enter roman numeral to convert: ");

numeral =in.next();
int length = numeral.length();
 total = convertRomanNumber(total, length, numeral);

System.out.println("The roman numeral converted is: " + total);


// Method valueOf - Gives the value of the Roman numeral @param numeral a single Roman numeral

// @return the decimal value of numeral

//promp user to enter roman number

// then convert it to regular number


break;

case 4:

// exit program

System.out.println("Thank you for using our program. Have a great day!");

}

}


public static void wageCalculator(double hoursWorked, double overtimeHours, double hourlyRate, double regularPay) {

// TODO Auto-generated method stub

double overtimePay = 0;

if (hoursWorked > 40) {

overtimeHours = hoursWorked - 40;

System.out.println("Overtime hours: " + overtimeHours);

overtimePay = overtimeHours*(1.5*hourlyRate);

System.out.println("Overtime Pay: " + overtimePay);

System.out.printf("Total Pay $%.2f", regularPay + overtimePay);

hoursWorked = 40;

}

regularPay = hourlyRate*hoursWorked;

System.out.println("Regular hours worked: " + hoursWorked);

System.out.println("Regular Pay: $" + regularPay);

System.out.printf("Total Pay $%.2f", regularPay + overtimePay);

}

// add all variables to method header

public static void couponCalculator(int purchaseType, double purchaseAmount, double autoP, double frag, double acc) {

if (purchaseType == autoP) {

System.out.println("Your coupon is: $" + purchaseAmount*.10 + "(Auto Parts)");

} if (purchaseType == frag) {

System.out.println("Your coupon is: $" + purchaseAmount*.15 + "(Fragrances)");

} if (purchaseType == acc) {

System.out.println("Your coupon is: $" + purchaseAmount*.20 + "(Accessories)");

}

}

public static int convertRomanNumber(int total,int length,String str) {

  for(int i=0;i<length;i++)//loop till length of string
  {
      int str1=valueOf(str.charAt(i));//getting value at str[i];
      if(i+1<length)
      {
          int str2=valueOf(str.charAt(i+1));//at str[i+1]
          
          if(str1<str2)
          {
              total=total+(str2-str1);
              i++;
          }
          else if(str1>=str2)
          {//if(current symbol is greater than or equal to next symbol then need to add both number otherwise subtract (str2-str1) 
              total=total+str1;
              
          }

          
      }else{
          total=total+str1;//simply add last number
          i++;
          
      }
  }

return total;

}

public static int valueOf(char numeral) {

if (numeral == 'I') {

return 1;

}

if (numeral == 'V') {

return 5;

} if (numeral == 'X') {

return 10;

} if (numeral == 'L') {

return 50;

} if (numeral == 'C') {

return 100;

} if

(numeral == 'D')

return 500;

else if (numeral == 'M')

return 1000;

return -1;

}

}

//you have done a pretty nice job well-done keep growing!!

//code is self-explanatory do tell me in comment if unable to understand!!