Hi there guys
The other time I asked help to know how to do a program how to know if the number given by the user is greater or less than 10
But Now i gotta know which number is greater but with the user input for exampleÑ
Give me the first number: 5
Give me the second number: 14
14 is greater
Does anyone has an idea how to do this?
Thanks guys
What about a simple compare of both numbers? Your question sounds like homework. We won't do that for you.
Gunther
Quote from: rodolfolopes on October 21, 2014, 08:20:58 AM
Give me the first number: 5
Give me the second number: 14
Look in \Masm32\Help\*.chm for:
- console input functions
- ascii to dword conversion
- the cmp and jg instructions (opcodes.chm)
Don´t forget you need non-volatile registers (esi, edi, ebx) to store the first number - getting the second number will trash eax ecx edx
Quote from: jj2007 on October 21, 2014, 09:20:37 AM
Quote from: rodolfolopes on October 21, 2014, 08:20:58 AM
Give me the first number: 5
Give me the second number: 14
Look in \Masm32\Help\*.chm for:
- console input functions
- ascii to dword conversion
- the cmp and jg instructions (opcodes.chm)
Don´t forget you need non-volatile registers (esi, edi, ebx) to store the first number - getting the second number will trash eax ecx edx
Sorry guys Yeah basically its my today homework but I just needed another example than mine.
I have been trying this code but its now working
It always tells me that the second number is greater!!
ANy ideas!
include \masm32\include\masm32rt.inc
.code
start:
mov esi, input("GIVE ME THE FIRST NUMBER: ",62," ")
mov ecx, input("GIVE ME THE SECOND NUMBER: ",62," ")
invoke atodw, eax
invoke atodw,esi
.if esi < eax
print "FIRST NUMBER IS GREATER ", 13, 10
.elseif esi >eax
print "SECOND NUMBER IS GREATER", 13, 10
.elseif esi==eax
print "NUMBERS ARE EQUAL", 13, 10
.endif
print "-----------------------------------------------------------", 13, 10
exit
end start
; #########################################################################
; ---------------------------------------------------------------
; This procedure was originally written by Tim Roberts
;
; Part of this code has been optimised by Alexander Yackubtchik
; ---------------------------------------------------------------
.486
.model flat, stdcall ; 32 bit memory model
option casemap :none ; case sensitive
.code
; #########################################################################
atodw proc String:DWORD
; ----------------------------------------
; Convert decimal string into dword value
; return value in eax
; ----------------------------------------
push esi
push edi
xor eax, eax
mov esi, [String]
xor ecx, ecx
xor edx, edx
mov al, [esi]
inc esi
cmp al, 2D
jne proceed
mov al, byte ptr [esi]
not edx
inc esi
jmp proceed
@@:
sub al, 30h
lea ecx, dword ptr [ecx+4*ecx]
lea ecx, dword ptr [eax+2*ecx]
mov al, byte ptr [esi]
inc esi
proceed:
or al, al
jne @B
lea eax, dword ptr [edx+ecx]
xor eax, edx
pop edi
pop esi
ret
atodw endp
; #########################################################################
end
mov esi, input("GIVE ME THE FIRST NUMBER: ",62," ")
mov ecx, input("GIVE ME THE SECOND NUMBER: ",62," ")
invoke atodw, eax
invoke atodw, esi
EAX, ECX, and EDX are volatile registers across calls
and, the first atodw call returns a value in EAX - which is destroyed by the second atodw call
mov esi, input("GIVE ME THE FIRST NUMBER: ",62," ")
mov ecx, input("GIVE ME THE SECOND NUMBER: ",62," ")
invoke atodw, ecx
xchg eax, esi
invoke atodw, eax
now, the first dword is in EAX and the second dword is in ESI
You need to use the mnemonic "CMP" then branch from the result using conditional jumps.
cmp eax, 10
jg greater
je equal
jl lessthan
; more code ....
greater:
equal:
lessthan:
I have used signed comparison evaluation with the conditional jumps, it can also be done in unsigned branching.
hutch--,
cmp eax, 10
jg greater
je equal
jl lessthan
; more code ....
greater:
equal:
lessthan:.data
table dd greater,lessthan, 62 dup (0),equal
.code
cmp eax, 10
pushf
pop ebx
and ebx,1000001b
jmp table[ebx*4](http://www.cyberforum.ru/images/smilies/smile3.gif)
:biggrin:
Nice optimisation but I am not sure our friend needs that yet.
Quote from: hutch-- on October 21, 2014, 02:50:59 PM
:biggrin:
Nice optimisation but I am not sure our friend needs that yet.
I think it's to sophisticated for him.
Gunther
Rodolfo,
Your code is almost OK. You need to move the FIRST result into a non-volatile register like esi (or edi, ebx).
Quote from: dedndave on October 21, 2014, 11:18:33 AMthe first atodw call returns a value in EAX - which is destroyed by the second atodw call
include \masm32\include\masm32rt.inc
.code
start:
invoke atodw, input("GIVE ME THE FIRST NUMBER: ",62," ")
xchg eax, esi ; move result to non-volatile register esi
invoke atodw, input("GIVE ME THE SECOND NUMBER: ",62," ")
.if esi > eax
print "FIRST NUMBER IS GREATER ", 13, 10
.elseif esi < eax
print "SECOND NUMBER IS GREATER", 13, 10
.elseif esi==eax
print "NUMBERS ARE EQUAL", 13, 10
.endif
print "-----------------------------------------------------------", 13, 10
exit
end startInstead of
xchg eax, esi you can use
mov esi, eax - but it's one byte longer ;-)