cmp.asm

; Assemble as: nasm -f elf -g readwrite.asm
; Link as: ld -m elf_i386 -o readwrite readwrite.o

section .data ;Data segment 
    prompt db 'Enter a number: '
	StrLen equ $-prompt
	
    DispNum db 'You entered: '  
    DispNumLen equ $-DispNum    

    msg1 db "
ebx > eax", 0xa
    msg2 db "ebx < eax", 0xa
    MsgLen equ $-msg2 ;The length of the message     
    
    num1 dd ''
    num2 dd ''
    num3 dd ''
    
    
    
section .bss    ;Uninitialized data 
	num resb 5 

section .text   ;Code Segment 
global _start 
_start: 
    ;1	
    ;Prompt User 
	mov eax, 4 
	mov ebx, 1     ; descriptor value for stdout
	mov ecx, prompt
	mov edx, StrLen
	int 80h 

	;Read and store the user input 
	mov eax, 3 
	mov ebx, 0     ; descriptor value for stdin
	mov ecx, num1 
	mov edx, 5     ;5 bytes (numeric, 1 for sign) of that information 
	int 80h 

    ;Prompt for a number  
	mov eax, 4 
	mov ebx, 1 
	mov ecx, DispNum
	mov edx, DispNumLen
	int 80h 

	;Output the number entered 
	mov eax, 4 
	mov ebx, 1 
	mov ecx, num1 
	mov edx, 5 
	int 80h 

    ;2
	;Prompt User 
	mov eax, 4 
	mov ebx, 1     ; descriptor value for stdout
	mov ecx, prompt
	mov edx, StrLen
	int 80h 

	;Read and store the user input 
	mov eax, 3 
	mov ebx, 0     ; descriptor value for stdin
	mov ecx, num2 
	mov edx, 5     ;5 bytes (numeric, 1 for sign) of that information 
	int 80h 

    ;Prompt for a number  
	mov eax, 4 
	mov ebx, 1 
	mov ecx, DispNum 
	mov edx, DispNumLen 
	int 80h 

	;Output the number entered 
	mov eax, 4 
	mov ebx, 1 
	mov ecx, num2 
	mov edx, 5 
	int 80h 


    ;3
	;Prompt User 
	mov eax, 4 
	mov ebx, 1     ; descriptor value for stdout
	mov ecx, prompt
	mov edx, StrLen
	int 80h 

	;Read and store the user input 
	mov eax, 3 
	mov ebx, 0     ; descriptor value for stdin
	mov ecx, num3 
	mov edx, 5     ;5 bytes (numeric, 1 for sign) of that information 
	int 80h 
    
    ;Prompt for a number  
	mov eax, 4 
	mov ebx, 1 
	mov ecx, DispNum
	mov edx, DispNumLen 
	int 80h 

	;Output the number entered 
	mov eax, 4 
	mov ebx, 1 
	mov ecx, num3 
	mov edx, 5 
	int 80h 

   nop
   mov eax, [num1]
   mov ebx, [num2]
   cmp ebx, eax ; test to see if ebx > eax
   jge greater  ; jump to "greatest" if true
   mov edx, MsgLen  ; msg length
   mov ecx, msg2
   mov ebx, 1   ; stdout
   mov eax, 4   ; write
   int 0x80
   mov eax, 1   ;exit
   int 0x80
greater:
   mov edx, MsgLen
   mov ecx, msg1
   mov ebx, 1   ; stdout
   mov eax, 4   ; write
   int 0x80
   mov eax, 1   ;exit
   int 0x80