assembly - Pythagorean triple test, yasm x64 -

i'm using yasm assembler on 64-bit linux. following program prints "false", while think should print "true":

section .data       db  3     b   db  4     c   db  5     succ    db  "true", 0x0a     fail    db  "false", 0x0a  section .text  global _start  _start:     mov eax, [a]     mov ebx, [b]     mov ecx, [c]      imul eax, eax   ;eax contains a^2     imul ebx, ebx   ;ebx contains b^2     imul ecx, ecx   ;ecx contains c^2      add  eax, ebx   ;eax contains a^2 + b^2     sub  eax, ecx   ;eax contains (a^2 + b^2) - c^2     cmp  eax, 0     jne  failure  success:     mov  eax, 1     ;write call     mov  edi, 1     ;stdout     mov  esi, succ     mov  edx, 5     ;write 5 bytes     syscall     jmp end  failure:     mov  eax, 1     ;write call     mov  edi, 1     ;stdout     mov  esi, fail     mov  edx, 6     ;write 6 bytes     syscall  end:     mov  eax, 60    ;64-bit exit call     mov  edi, 0     syscall  

is there problem flags? apparently "not equal" evaluating true.

your variables byte sized load 4 bytes each. use movzx sign-extend, such as:

movzx eax, byte [a] movzx ebx, byte [b] movzx ecx, byte [c] 

ps: learn use debugger.