(gdb.info) Output Formats

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 Output formats
 ==============
 
    By default, GDB prints a value according to its data type.  Sometimes
 this is not what you want.  For example, you might want to print a
 number in hex, or a pointer in decimal.  Or you might want to view data
 in memory at a certain address as a character string or as an
 instruction.  To do these things, specify an "output format" when you
 print a value.
 
    The simplest use of output formats is to say how to print a value
 already computed.  This is done by starting the arguments of the
 `print' command with a slash and a format letter.  The format letters
 supported are:
 
 `x'
      Regard the bits of the value as an integer, and print the integer
      in hexadecimal.
 
 `d'
      Print as integer in signed decimal.
 
 `u'
      Print as integer in unsigned decimal.
 
 `o'
      Print as integer in octal.
 
 `t'
      Print as integer in binary.  The letter `t' stands for "two".  (1)
 
 `a'
      Print as an address, both absolute in hexadecimal and as an offset
      from the nearest preceding symbol.  You can use this format used
      to discover where (in what function) an unknown address is located:
 
           (gdb) p/a 0x54320
           $3 = 0x54320 <_initialize_vx+396>
 
 `c'
      Regard as an integer and print it as a character constant.
 
 `f'
      Regard the bits of the value as a floating point number and print
      using typical floating point syntax.
 
    For example, to print the program counter in hex (
 Registers), type
 
      p/x $pc
 
 Note that no space is required before the slash; this is because command
 names in GDB cannot contain a slash.
 
    To reprint the last value in the value history with a different
 format, you can use the `print' command with just a format and no
 expression.  For example, `p/x' reprints the last value in hex.
 
    ---------- Footnotes ----------
 
    (1) `b' cannot be used because these format letters are also used
 with the `x' command, where `b' stands for "byte"; see  Examining
 memory Memory.
 

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