7-13.asm

tr1 byte "Please input the first 64-bit in hex:first - second",0dh,0ah,0 string byte "remener :us

TITLE 7-13
include allyssa32.inc
.data
  str1 byte "Please input the first 64-bit in hex:first - second",0dh,0ah,0 
  string byte "remener :use enter to tell high 32-bit from low 32-bit",0dh,0ah,0
  examp1 byte "eg: 1234ecdf",0dh,0ah,0
  examp2 byte "    03ab2543",0dh,0ah,0
  str2 byte "Please input the second 64-bit in hex:first - second",0dh,0ah,0
  str3 byte "The result is :",0dh,0ah,0
  jia1 sdword 2 dup(0)
  jia2 sdword 2 dup(0)
.code
main proc
    mov edx,offset str1
    call writestring
    mov edx,offset string
    call writestring
    mov edx,offset examp1
    call writestring
    mov edx,offset examp2
    call writestring
    mov esi,0
    mov ecx,2
    push ecx
    push esi
L1: 
    call readhex
    mov jia1[esi],eax
    add esi,4
loop L1
    pop esi
    pop ecx
    mov edx,offset str2 
    call writestring 
    mov edi,0
    push edi
L2:
    call readhex
    mov jia2[edi],eax
    add edi,4
loop L2
    pop edi
    mov edx,offset str3
    call writestring
    mov eax,jia1[esi+4]
    mov ebx,jia1[esi]
    clc
    sub eax,jia2[edi+4]
    sbb ebx,jia2[edi]
    push eax
    mov eax,ebx
    call writehex
    pop eax
    call writehex
    exit
main endp
end main