why is segmention fault while printing?

Question

This is my x86 assembly code:

section .data 
  output db \'%d\',10,0
section .text 
  global main
  extern printf 
main :
  xor ecx,ecx
  xor eax,eax
  mov eax,1         


        

Answer 1

print ends with a ret instruction, which implies that it is something that you should call. So jg print should be jng skip / call print / skip: (or just call print, because the > 0 check seems unnecessary).
call places the return address on the stack, jg does not.