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.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;
            case 3:
                    System.out.print("Enter the inital mass: "); //Ask user for inital mass

View Full Code Here

                    n = y / Math.exp(k*t); //Calculate inital mass
                    System.out.print("Inital Amount: " + n); //Display inital mass
            break;
            case 3:
                    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 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)
                    k = Math.log(y / n) / t;

View Full Code Here

            break;
            case 3:
                    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 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)
                    k = Math.log(y / n) / t;
                    System.out.print("Constant Half-life: " + k); //Display half-life
            break;

View Full Code Here

                    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 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)
                    k = Math.log(y / n) / t;
                    System.out.print("Constant Half-life: " + k); //Display half-life
            break;
            default: System.out.print("Really?"); break; //Easter egg if you enter a number not on the menu
        }

View Full Code Here

        final double PI = 3.1415926535; //set const PI to 3.1415926535
        double radius; //variable for radius of circle (data from User)
        double circum; //variable for circumference of circle (calculated)
        
        System.out.print("Enter a circle radius: "); //Asks user for radius
        radius = input.nextDouble(); //collects double from user for radius
        if (radius < 0) { //If radius is negative
            System.out.println("Negative radii are illegal."); //print 'Negative Radii are illegal'
        } else { //If radius is postive
            circum = 2 * PI * radius; //calculates circumference
            System.out.println("The Circumference for this circle is: " + circum); //displays circumference

View Full Code Here

      writeFile = new BufferedWriter(out);
      for (int i = 0; i < 5; i++) {
        System.out.print("Enter student name: ");
        name = input.next();
        System.out.print("Enter test score: ");
        score = input.nextDouble();
        writeFile.write(name);
        writeFile.newLine();
        writeFile.write(String.valueOf(score));
        writeFile.newLine();
      }

View Full Code Here

  public static void fahrenheitToCelsius() {
    double fTemp, cTemp;
    Scanner input = new Scanner(System.in);
    
    System.out.print("Enter a Fahrenheit temperature: ");
    fTemp = input.nextDouble();
    input.close();
    
    cTemp = (double)5/(double)9*(fTemp - 32);
    System.out.println("The Celsius temperature is " + cTemp);
  }

View Full Code Here

  public static void celsiusToFahrenheit() {
    double cTemp, fTemp;
    Scanner input = new Scanner(System.in);
    
    System.out.print("Enter a Celsius temperature: ");
    cTemp = input.nextDouble();
    input.close();
    
    fTemp = (double)9/(double)5*cTemp + 32;
    System.out.println("The Fahrenheit temperature is " + fTemp);
  }

View Full Code Here

        double principal; //Variable to hold first amount
        double years;     //Variable to hold year  amount
        double interest;  //Variable to hold interest amount
        double amount;    //Variable to hold end   amount
        System.out.print("Enter the amount: "); //Ask user for end amount
        amount = input.nextDouble(); //Collect end amount
        System.out.print("Enter the number of years: "); //Ask user for year amount
        years = input.nextDouble(); //Collect year amount
        System.out.print("Enter the interest rate: "); //Ask user for interest amount
        interest = input.nextDouble(); //Collect interest amount
        principal = amount / (1 + years * interest); //Calculate start amount

View Full Code Here

        double interest;  //Variable to hold interest amount
        double amount;    //Variable to hold end   amount
        System.out.print("Enter the amount: "); //Ask user for end amount
        amount = input.nextDouble(); //Collect end amount
        System.out.print("Enter the number of years: "); //Ask user for year amount
        years = input.nextDouble(); //Collect year amount
        System.out.print("Enter the interest rate: "); //Ask user for interest amount
        interest = input.nextDouble(); //Collect interest amount
        principal = amount / (1 + years * interest); //Calculate start amount
        System.out.print("The amount needed is: " + money.format(principal)); //Print end amount formated as currency
        }

View Full Code Here

0 1 2 3 4 5 6 7 8 9

TOP

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.