output of the c format for gdb x command

Question

From the documentation at [1], an example output for the gdb x command in c format is as follows:

(gdb) x/c testArray
0xbfffef7b: 48 '0'
(gdb) x/5c testArray
0xbfffef7b: 48 '0' 49 '1' 50 '2' 51 '3' 52 '4'

What does these numbers, such as 48, 49, 50 in the output mean?

Is it some kind of relative address?

Thank you very much!

[1] http://visualgdb.com/gdbreference/commands/x

Answer 1

x is displaying the memory contents at a given address using the given format.

In your specific case, x/5c is displaying the first 5 bytes at the memory location testArray , and printing the bytes as a char .

The first 5 bytes of testArray are the characters 0 , 1 , 2 , 3 , 4 (the value in single quotes). The value before is the decimal value of the char.