How do I limit the number of decimals printed for a double

Question

This program works  except when the number of nJars is a multiple of 7  I will get an answer like  14 999999999999998  For 6  the output is 14 08  How do I fix exceptions for multiples of 7 so it will display something like  14 99   import java util Scanner  public class Homework 17    private static int nJars  nCartons  totalOunces  OuncesTolbs  lbs    public static void main String   args         computeShippingCost           public static void computeShippingCost          System out print  Enter a number of jars         Scanner kboard   new Scanner  System in      nJars   kboard nextInt       int nCartons    nJars   11    12     int totalOunces    nJars   21     nCartons   25      int lbs   totalOunces   16     double shippingCost      nCartons   1 44     lbs   1    0 96    3 0      System out print       shippingCost

User · Answer

If you want to print write double value at console then use System out printf   or System out format   methods   System out printf   n  10 2f  shippingCost   System out printf   n   2f  shippingCost

User · Answer

Use the DecimalFormat class to format the double

User · Answer

Check out DecimalFormat  http   docs oracle com javase 6 docs api java text DecimalFormat html  You ll do something like   new DecimalFormat     00   format shippingCost     Or since you re working with currency  you could see how NumberFormat getCurrencyInstance   works for you

User · Answer

You use the String format   method

User · Answer

Formatter class is also a good option  fmt format    2f   variable   2 here is showing how many decimals you want  You can change it to 4 for example  Don t forget to close the formatter    private static int nJars  nCartons  totalOunces  OuncesTolbs  lbs    public static void main String   args         computeShippingCost           public static void computeShippingCost          System out print  Enter a number of jars         Scanner kboard   new Scanner  System in      nJars   kboard nextInt       int nCartons    nJars   11    12     int totalOunces    nJars   21     nCartons   25      int lbs   totalOunces   16       double shippingCost      nCartons   1 44     lbs   1    0 96    3 0        Formatter fmt   new Formatter         fmt format    2f   shippingCost       System out print       fmt       fmt close

User · Answer

Use a DecimalFormatter   double number   0 9999999999999  DecimalFormat numberFormat   new DecimalFormat    00    System out println numberFormat format number      Will give you  0 99   You can add or subtract 0 on the right side to get more or less decimals    Or use     on the right to make the additional digits optional  as in with       0 30  would drop the trailing 0 to become  0 3

User · Answer

okay one other solution that I thought of just for the fun of it would be to turn your decimal into a string and then cut the string into 2 strings  one containing the point and the decimals and the other containing the Int to the left of the point  after that you limit the String of the point and decimals to 3 chars  one for the decimal point and the others for the decimals  then just recombine   double shippingCost     nCartons   1 44     lbs   1    0 96    3 0  String ShippingCost    String  shippingCost  String decimalCost   ShippingCost subString indexOf      ShippingCost Length     ShippingCost   ShippingCost subString 0 indexOf        ShippingCost   ShippingCost   decimalCost    There  Simple  right

[java] How do I limit the number of decimals printed for a double?

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