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 (see section 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 section Output formats.
print
print /f: If you omit exp, GDB displays the last value again (from the value history; see section 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 section 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 section Examining the Symbol Table.

Expressions: Expressions
Variables: Program variables
Arrays: Artificial arrays
Output Formats: Output formats
Memory: Examining memory
Auto Display: Automatic display
Print Settings: Print settings
Value History: Value history
Convenience Vars: Convenience variables
Registers: Registers
Floating Point Hardware: Floating point hardware

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