what do these symbolic strings mean 02d 01d

Question

I m looking at a code line similar to   sprintf buffer   02d  02d  02d  hour minute second     I think the symbolic strings refer to the number of numeric characters displayed per hour  minute etc - or something like that  I am not entirely certain    Normally I can figure this sort of thing out but I have been unable to find any useful reference searching   02d  01d  on google  Anyone able to shed some light on this for me

User · Answer

Instead of Googling for  02d you should have been searching for sprintf   function    02d means  format the integer with 2 digits  left padding it with zeroes   so    Format  Data   Result  02d    1      01  02d    11     11

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They are formatting String  The Java specific syntax is given in java util Formatter   The general syntax is as follows        argument index   flags  width   precision conversion    02d performs decimal integer conversion d  formatted with zero padding  0 flag   with width 2  Thus  an int argument whose value is say 7  will be formatted into  07  as a String   You may also see this formatting string in e g  String format     Commonly used formats  These are just some commonly used formats and doesn t cover the syntax exhaustively   Zero padding for numbers  System out printf  Agent  03d to the rescue    7      Agent 007 to the rescue    Width for justification  You can use the - flag for left justification  otherwise it ll be right justification   for  Map Entry lt Object Object gt  prop   System getProperties   entrySet          System out printf   -30s    50s n   prop getKey    prop getValue         This prints something like   java version                                                     1 6 0 07 java vm name                                   Java HotSpot TM  Client VM java vm vendor                                      Sun Microsystems Inc  java vm specification name             Java Virtual Machine Specification java runtime name                         Java TM  SE Runtime Environment java vendor url                                      http   java sun com    For more powerful message formatting  you can use java text MessageFormat   n is the newline conversion  see below    Hexadecimal conversion  System out println Integer toHexString 255       ff  System out printf   d is   lt 08X   255      255 is 000000FF   Note that this also uses the  lt  relative indexing  see below    Floating point formatting  System out printf     010 2f n   1234 567   System out printf     010 2f n   -66 6666       01 234 57    -000066 67   For more powerful floating point formatting  use DecimalFormat instead    n for platform-specific line separator  System out printf   s  n s n    Hello    World       Hello     World      for an actual  -sign  System out printf  It s  s   guaranteed    99 99      It s 99 99  guaranteed    Note that the double literal 99 99 is autoboxed to Double  on which a string conversion using toString   is defined   n  for explicit argument indexing  System out printf   1 s   1 s  2 s   1 s  2 s  3 s         Du    hast    mich        Du  Du hast  Du hast mich     lt  for relative indexing  System out format   s     lt S         Who s your daddy       Who s your daddy   WHO S YOUR DADDY          Related questions   Why is String   s format Object    args  defined as a static method  escaping formatting characters in java String format Is it better practice to use String format over string Concatenation in Java  Should I use Java   s String format   if performance is important  Understanding the   in Java   s format strings java decimal String format  difference between system out printf and String format What classes do you use to make string templates  -- MessageFormat with example

User · Answer

http   www cplusplus com reference clibrary cstdio printf   the same rules should apply to Java   in your case it means output of integer values in 2 or more digits  the first being zero if number less than or equal to 9

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The answer from Alexander refers to complete docs     Your simple example from the question simply prints out these values with 2 digits - appending leading 0 if necessary

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http   en wikipedia org wiki Printf printf format placeholders  The article is about the class of printf functions  in several languages  from the 50s to this day

User · Answer

is a special character you put in format strings  for example in C language printf and scanf  and family   that basically says  quot this is a placeholder for something else  not to be printed read literally  quot   For example  a   02d  in a format string for printf is a placeholder for an integer variable that will be printed in decimal    02d   and padded to at least two digits  with zeros if necessary   The actual integer is supplied by you in an an argument to the function  e g  printf  quot  02d quot  5   would print 05 on screen    01d  also works similarly   Same hold for Java and other languages too

[java] what do these symbolic strings mean: %02d %01d?

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