'1' '2' '\n' '5' '2' '1' '\n'

line ch   value     power9  quotient
9    '1'  ?         ?
11        0
16                                   true
19        1
25   '2'                             true
16                                   true
19        9
25   '\n'                            true
16                                   false
25                                   false
28                  9*9*9*9*9
29                                   true
33                          0
34  '0'
35                                            '0'
36        9
37                  9*9*9*9
29                                   true
33                          0
34  '0'
35                                            '0'
36        9
37                  9*9*9
29                                   true
33                          0
34  '0'
35                                            '0'
36        9
37                  9*9
29                                   true
33                          0
34  '0'
35                                            '0'
36        9
37                  9
29                                   true
33                          1
34  '1'
35                                            '1'
36        0
37                  1
29                                   true
33                          0
34  '0'
35                                            '0'
36        0
37                  0
29                                   false
39  '\n'
40                                            '\n'
9   '5'
11        0

a = ((b * (c + d)) + 1) / e

# c + d
  movl c,%eax
  addl d,%eax # %eax is c + d
# b * (c + d)
  movl %eax,%ebx
  movl b,%eax
  mull %ebx   # eax is b * (c + d)
# ((b * (c + d)) + 1)
  addl $1,%eax  # eax (b * (c + d)) + 1
# ((b * (c + d)) + 1) / e
  movl e,%ebx
  movl $0,%edx
  divl %ebx
  movl %eax,a
  
  
while (fread(&ch, 1, 1, stdin))
{
  blah
}
==========================================
draft 1
checkPrecondition:
if not fread(&ch, 1, 1, stdin) then
  goto exitLoop
end if
blah
goto checkPrecondition
exitLoop:

==========================================
draft 2:
checkPrecondition:
if fread(&ch, 1, 1, stdin) == 0 then
  goto exitLoop
end if
blah
goto checkPrecondition
exitLoop:

==========================================
draft 3:
checkPrecondition:
fread(&ch, 1, 1, stdin)
if eax == 0 then
  goto exitLoop
end if
blah
goto checkPrecondition
exitLoop:

==========================================
draft 4:
checkPrecondition:
fread(&ch, 1, 1, stdin)
   cmpl $0,%eax
   jz   exitLoop
# blah
   jmp  checkPrecondition
exitLoop:

==========================================
draft 5:
checkPrecondition:
   movl $3,%eax # read from a file
   movl $0,%ebx # stdin
   movl $ch,%ecx # &ch
   movl $1,%edx  # read a single byte
   int  $0x80
   cmpl $0,%eax
   jz   exitLoop
# blah
   jmp  checkPrecondition
exitLoop: