Examples of java.util.Scanner.nextDouble()

java.util.Scanner.nextDouble()
Scans the next token of the input as a double. This method will throw InputMismatchException if the next token cannot be translated into a valid double value. If the translation is successful, the scanner advances past the input that matched.
If the next token matches the Float regular expression defined above then the token is converted into a double value as if by removing all locale specific prefixes, group separators, and locale specific suffixes, then mapping non-ASCII digits into ASCII digits via {@link Character#digit Character.digit}, prepending a negative sign (-) if the locale specific negative prefixes and suffixes were present, and passing the resulting string to {@link Double#parseDouble Double.parseDouble}. If the token matches the localized NaN or infinity strings, then either "Nan" or "Infinity" is passed to {@link Double#parseDouble(String) Double.parseDouble} as appropriate. @return the double scanned from the input @throws InputMismatchException if the next token does not match the Float regular expression, or is out of range @throws NoSuchElementException if the input is exhausted @throws IllegalStateException if this scanner is closed

    System.out.println("What was deposit amount for month " + months + "? ");
    deposit = keyboard.nextDouble();
    account.deposit(deposit);
    
    System.out.println("What was withdrawal amount for month " + months + "? ");
    withdrawal = keyboard.nextDouble();
    account.withdraw(withdrawal);
    
    account.earned();
    months--;
    }

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        double usrIn = 0; //temp var for grades
        int pass = 0; //counter var for amount passing marks
        System.out.println("The super handy percent passing calculator!"); //intro sentence
        while (usrIn != SENTINEL) { //While the user has not tried to exit the loop, loop.
            System.out.print("Enter a grade or -1 to quit: "); //Ask user for grade or flag
            usrIn = input.nextDouble(); //Collect input
            if (usrIn > 70) { //If the number is higher than 70
                pass++; //Add one to the pass counter
            } //end if
        } //end while
        System.out.print("Number of passing grades is "+pass); //Display number of passing grades

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    System.out.print("First name: ");
    fName = input.nextLine();
    System.out.print("Last name: ");
    lName = input.nextLine();
    System.out.print("Beginning balance: ");
    bal = input.nextDouble();
    
    newAcct = new Account(bal, fName, lName);  //create account object
    accounts.add(newAcct);            //add account to bank accounts
    
    System.out.println("Account created. Account ID is: " + newAcct.getID());

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      } else if (!action.equalsIgnoreCase("Q")) {
        System.out.print("Enter account ID: ");
        acctID = input.next();
        if (action.equalsIgnoreCase("D")) {
          System.out.print("Enter deposit amount: ");
          amt = input.nextDouble();
          easySave.transaction(1, acctID, amt);
        } else if (action.equalsIgnoreCase("W")) {
          System.out.print("Enter withdrawal amount: ");
          amt = input.nextDouble();
          easySave.transaction(2, acctID, amt);

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          System.out.print("Enter deposit amount: ");
          amt = input.nextDouble();
          easySave.transaction(1, acctID, amt);
        } else if (action.equalsIgnoreCase("W")) {
          System.out.print("Enter withdrawal amount: ");
          amt = input.nextDouble();
          easySave.transaction(2, acctID, amt);
        } else if (action.equalsIgnoreCase("C")) {
          easySave.checkBalance(acctID);
        } else if (action.equalsIgnoreCase("R")) {
          easySave.deleteAccount(acctID);

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        System.out.print("1. Final Amount\n2. Inital Amount\n3. Half-life (constant)\nFind: "); //Ask which equation to do
        double n, y, k, t; //Initalize intial mass, final mass, half-life and time in that order
        switch (input.nextInt()) { //Switch the input from the user
            case 1: //If user entered 1 (final mass)
                    System.out.print("Enter the inital mass: "); //Ask user for inital mass
                    n = input.nextDouble(); //Collect inital mass from user
                    System.out.print("Enter the time (years): "); //Ask user for time (years)
                    t = input.nextDouble(); //Collect time (years) from user
                    System.out.print("Enter half-life (Constant): "); //Ask user for half-life
                    k = input.nextDouble(); //Collect half-life from user
                    y = n / Math.exp((-k*t)); //Calculate final mass

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        switch (input.nextInt()) { //Switch the input from the user
            case 1: //If user entered 1 (final mass)
                    System.out.print("Enter the inital mass: "); //Ask user for inital mass
                    n = input.nextDouble(); //Collect inital mass from user
                    System.out.print("Enter the time (years): "); //Ask user for time (years)
                    t = input.nextDouble(); //Collect time (years) from user
                    System.out.print("Enter half-life (Constant): "); //Ask user for half-life
                    k = input.nextDouble(); //Collect half-life from user
                    y = n / Math.exp((-k*t)); //Calculate final mass
                    System.out.print("Final Amount: " + y); //Display final mass
            break;

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                    System.out.print("Enter the inital mass: "); //Ask user for inital mass
                    n = input.nextDouble(); //Collect inital mass from user
                    System.out.print("Enter the time (years): "); //Ask user for time (years)
                    t = input.nextDouble(); //Collect time (years) from user
                    System.out.print("Enter half-life (Constant): "); //Ask user for half-life
                    k = input.nextDouble(); //Collect half-life from user
                    y = n / Math.exp((-k*t)); //Calculate final mass
                    System.out.print("Final Amount: " + y); //Display final mass
            break;
            case 2: //if user entered 2 (inital mass) 
                    System.out.print("Enter the final mass: "); //Ask user for final mass

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                    y = n / Math.exp((-k*t)); //Calculate final mass
                    System.out.print("Final Amount: " + y); //Display final mass
            break;
            case 2: //if user entered 2 (inital mass) 
                    System.out.print("Enter the final mass: "); //Ask user for final mass
                    y = input.nextDouble(); //Collect final mass
                    System.out.print("Enter the time (years): "); //Ask user for time (years)
                    t = input.nextDouble(); //Collect time (years)
                    System.out.print("Enter half-life (Constant): "); //Ask user for half-life
                    k = input.nextDouble(); //Collect half-life from user
                    n = y / Math.exp(k*t); //Calculate inital mass

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            break;
            case 2: //if user entered 2 (inital mass) 
                    System.out.print("Enter the final mass: "); //Ask user for final mass
                    y = input.nextDouble(); //Collect final mass
                    System.out.print("Enter the time (years): "); //Ask user for time (years)
                    t = input.nextDouble(); //Collect time (years)
                    System.out.print("Enter half-life (Constant): "); //Ask user for half-life
                    k = input.nextDouble(); //Collect half-life from user
                    n = y / Math.exp(k*t); //Calculate inital mass
                    System.out.print("Inital Amount: " + n); //Display inital mass
            break;

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