Change to program to read address and then using the address load byte and add. yasm -g dwarf2 -f elf64 a 1.asm -1 a1.Ist Id-g -o a1 a1.o gdb./a1 i gdb commands :b_start ; s p/x $al ; s :p section data O EXIT_SUCCESS equ SYS exit egu 60 1.Use assembly language. 2.compile and run it. 3. (file type asm) you can find it in Brew as yasm. for the file type if you can great if not no big deal. Change to program to read address and then using the address load byte and add. yasm -g dwarf2 -f elf64 a1.asm -1 a 1.lst ;ld-g -o a1 a1.o ;gdb./a1 i gdb commands ;b_start ir ; s ip/x $al ; s ip section .data EXIT_SUCCESS equ 0 SYS_exit equ 60 bvar1 db 17; 0000 1001 0001 0001 ;; little endian - big endian 2048 + 256 8 1 bvar2 db 9 ; 4096 + 256 + 8 + 1 bvar3 db 0 wvar1 dw 17000 wvar2 dw 9000 wvar3 dwo dvar1 dd 17000000 dvar2 dd 9000000 dvar3 dd o