x86 - Multiply 2 Values in Assembly Language 8086? -

i multiplying 2 values input console window. using 32 bit registers eax, ebx, not multiplying values. program running, not multiplying. can detect problem? wrong in code? using kip.r.irvine link libraries in assembly language.

here code:

  include irvine32.inc    .data     inputvalue1st byte "input 1st integer = ",0    inputvalue2nd byte "input 2nd integer = ",0    outputsummsg byte "the sum of 2 integers = ",0     num1 dd ?    num2 dd ?    sum  dd ?     .code    main proc     ; here calling our procedures    call inputvalues   call multiplyvalue   call outputvalue   call crlf    exit   main endp    inputvalues proc  ;----------- 1st value-------- ; input message  call crlf mov edx,offset inputvalue1st call writestring   call readint    ; read integer mov num1, eax   ; store value    ;-----------for 2nd value----------   ; output prompt message  mov edx,offset inputvalue2nd  call writestring     call readint  ; read integer   mov num2, ebx     ; store value    ret   inputvalues endp       ;---------multiply----------------     multiplyvalue proc    ; compute sum      mov eax, num1   ; moves num1 eax     mov ebx, num2   ; moves num2 ebx      mul ebx  ; num1 * num2 = 6 * 2     mov sum, eax  ; val stored in ebx       ret     multiplyvalue endp       ;--------for sum output result----------      outputvalue proc       ; output result     mov edx, offset outputsummsg     call writestring       mov eax, sum     call writeint ; prints value in eax     ret     outputvalue endp       end main 

one more question: need use carry flag in it? if so, code like?

;mov eax, num1   ; moves num1 eax ;mov ebx, num2  ; moves num2 ebx 

might little if load values registers rather comment should doing,