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INCLUDE Irvine32.inc

.data
 Input byte "Insert Value: ", 0
 result byte "GCD is ", 0
 op1 dword ?
 op2 dword ?

.code
main PROC
 mov edx, offset Input
 call WriteString
 call ReadInt
 mov op1, eax
 call WriteString
 call ReadInt
 mov op2, eax

 call GCD_Function

 mov edx, offset Result
 call WriteString
 call WriteDec
 call Crlf

 exit
 main ENDP

GCD_Function PROC
 mov eax, op1
 mov ebx, op2

GCD_Operator:
 cmp eax, ebx
 jl Swap
 sub eax, ebx
 cmp ebx, 0
 je Quit
 jmp GCD_Operator

Swap:
 push eax
 push ebx
 pop eax
 pop ebx
 jmp GCD_Operator

Quit:
 ret
 GCD_Function ENDP

END main