4. Program to Simple Addition (2) in Assembly Language using Visual Studio

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Chapter 5

Procedures

Assembly Language Programming Exercise

Problem # 4:

Use the solution program from the preceding exercise as a starting point. Let this new program repeat the same steps three times, using a loop. Clear the screen after each loop iteration.

Solution:

INCLUDE Irvine32.inc

 .data
prompt BYTE "Enter a 32-bit signed integer:",0
resultMsg BYTE "Sum of 2 integers is:",0
int1 DWORD ?
int2 DWORD ?
sum DWORD ?

 .code
main PROC
    MOV ECX, 3
    L1:
        call Clrscr

         ;Move cursor to mid screen
        MOV DH, 13    ;y-coordinate range 0-24
        MOV DL, 40    ;x-coordinate range 0-79
        CALL GoToXY    ;locate cursor

         MOV EDX, OFFSET prompt    ;Display prompt
        CALL WriteString
        CALL ReadInt    ;Read integer
        MOV int1,EAX

         CALL WriteString
        CALL ReadInt    ;Read integer
        MOV int2,EAX

         ;calculate sum
        MOV EAX, int1
        ADD EAX, int2
        MOV sum, EAX

         ;display sum
        MOV EDX, OFFSET resultMsg
        call WriteString
        MOV EAX, sum
        call WriteInt
        call Crlf
        call WaitMsg

     LOOP L1

     exit
main ENDP

 END main