gdb.info: Data

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Examining Data

The usual way to examine data in your program is with the `print'
command (abbreviated `p'), or its synonym `inspect'.  It evaluates and
prints the value of an expression of the language your program is
written in (*note Using GDB with Different Languages: Languages.).
`print EXPR'
`print /F EXPR'
     EXPR is an expression (in the source language).  By default the
     value of EXPR is printed in a format appropriate to its data type;
     you can choose a different format by specifying `/F', where F is a
     letter specifying the format; see *Note Output formats: Output
     Formats.
`print'
`print /F'
     If you omit EXPR, GDB displays the last value again (from the
     "value history"; *note Value history: Value History.).  This
     allows you to conveniently inspect the same value in an
     alternative format.
   A more low-level way of examining data is with the `x' command.  It
examines data in memory at a specified address and prints it in a
specified format.  *Note Examining memory: Memory.
   If you are interested in information about types, or about how the
fields of a struct or a class are declared, use the `ptype EXP' command
rather than `print'.  *Note Examining the Symbol Table: Symbols.