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You can always enter numbers in octal, decimal, or hexadecimal in
GDB by the usual conventions: octal numbers begin with
`0', decimal numbers end with `.', and hexadecimal numbers
begin with `0x'. Numbers that begin with none of these are, by
default, entered in base 10; likewise, the default display for
numbers—when no particular format is specified—is base 10. You can
change the default base for both input and output with the set
radix
command.
set input-radix
baseset radix 012 set radix 10. set radix 0xa
sets the base to decimal. On the other hand, `set radix 10' leaves the radix unchanged no matter what it was.
set output-radix
baseshow input-radix
show output-radix