See the following documentation for more specific discussion on examining your data using GDB.
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 (see Using GDB with Different Languages).
print
exp
print /f exp
exp
is an expression (in the source language). By default the value of exp
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 Output
formats.
print
print /f
If you omit exp,
GDB displays the last value again (from the value history; see 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. See Examining memory.
If you are interested in information about types, or about how the fields of a struct or class are declared, use the ptype exp command rather than print. See Examining the Symbol Table.
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