VS 2017 (C/C++) / .386 architecture / Assembly language This is a practice with

Question

VS 2017 (C/C++) / .386 architecture / Assembly language

This is a practice with symbolic constant definitions either using integers or strings. The requirement is as follows:

1. Write a program that defines symbolic constants for all seven days of the week

• Define each integer value for symbol Monday, ..., Sunday to simulate C++ enumeration type

• In the data segment, create an array to uses these symbols as initializers

• Use $ operator to calculate the number of elements in the array

• In the code segment, watch the array count with a register

2. Write a program that defines symbolic names for several string literals

• Define three strings for symbol named like Message1, Message2, etc.

• In the data segment, use each symbolic name to initialize the string variables

• Try to use 0D and 0A, as well as a zero terminator in your definitions

• In the code segment, set a break point and when running in debug, you can watch your string memory

Explanation / Answer

part1.asm

.386
.model flat,stdcall
.stack 4096
ExitProcess proto,dwExitCode:dword

;Define each integer value for symbol Monday, ..., Sunday to simulate C++ enumeration type
Monday = 0
Tuesday = 1
Wednesday = 2
Thursday = 3
Friday = 4
Saturday = 5
Sunday = 6

.data
;In the data segment, create an array to uses these symbols as initializers
array DWORD Monday,Tuesday,Wednesday,Thursday,Friday,Saturday,Sunday

;Use $ operator to calculate the number of elements in the array
arraySize = ($ - array) / 4

.code
main1 proc
;In the code segment, watch the array count with a register
mov eax, arraySize
  invoke ExitProcess,0
main1 endp
end main1

============================================================================

part2.asm

.386
.model flat,stdcall
.stack 4096
ExitProcess proto,dwExitCode:dword

;Define three strings for symbol named like Message1, Message2, etc.
Message1 TEXTEQU <"Message1">
Message2 TEXTEQU <"Message2">
Message3 TEXTEQU <"Message3">

.data
;In the data segment, use each symbolic name to initialize the string variables
str1 BYTE Message1,0dh,0ah,0
str2 BYTE Message2,0dh,0ah,0
str3 BYTE Message3,0dh,0ah,0
.code
main1 proc
       ;no code needed, set a breakpoint here to watch the strings in memory
  invoke ExitProcess,0
main1 endp
end main1

==============================================================================

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