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 neither begin with ‘`0`’ or
‘`0x`’, nor end with a ‘`.`’ 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 commands described below.

`set input-radix`

`base`- Set the default base for numeric input. Supported choices
for
`base`are decimal 8, 10, or 16.`base`must itself be specified either unambiguously or using the current input radix; for example, any ofset input-radix 012 set input-radix 10. set input-radix 0xa

sets the input base to decimal. On the other hand, ‘

`set input-radix 10`’ leaves the input radix unchanged, no matter what it was, since ‘`10`’, being without any leading or trailing signs of its base, is interpreted in the current radix. Thus, if the current radix is 16, ‘`10`’ is interpreted in hex, i.e. as 16 decimal, which doesn't change the radix. `set output-radix`

`base`- Set the default base for numeric display. Supported choices
for
`base`are decimal 8, 10, or 16.`base`must itself be specified either unambiguously or using the current input radix. `show input-radix`

- Display the current default base for numeric input.
`show output-radix`

- Display the current default base for numeric display.
`set radix`

[`base`]`show radix`

- These commands set and show the default base for both input and output
of numbers.
`set radix`

sets the radix of input and output to the same base; without an argument, it resets the radix back to its default value of 10.