Program that input two single-digit numbers and one arithmetic operator (among: +, -, *, /, %); your program should perform the arithmetic operation accordingly and display the result.

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UNIVERSITY OF THE PUNJAB

Third Semester 2017

Examination: B.S. 4 Years Programme 

Paper: Computer Organization and Assembly Language

Course Code: IT-203 / 21402

Question # 5:

Write a program that should input two single-digit numbers and store them into registers or variables, your program should also input one arithmetic operator (among: +, -, *, /, %); your program should perform the arithmetic operation accordingly and display the result.

Solution:

INCLUDE Irvine32.inc

.data
msg BYTE "Enter a single-digit number : ",0
error BYTE "Wrong Input!, Please enter a single-digit number : ",0
error2 BYTE "Invalid input!",0
msg2 BYTE "Please enter an arithmetic operator : ",0
result BYTE "Result is : ",0
val1 BYTE ?
val2 BYTE ?
op BYTE ?
res WORD 0
.code
main PROC
    mov edx, offset msg
    call WriteString
    call ReadInt
    call ValidateInput
    mov val1, al
  
    mov edx, offset msg
    call WriteString
    call ReadInt
    call ValidateInput
    mov val2, al
  
    mov ax, 0
    mov edx, offset msg2
    call WriteString
    call ReadChar
    call WriteChar
    mov op, al

    mov bl, '+'
    .IF(op=='+')
        mov bl, val1
        add bl, val2
        mov byte ptr res, bl
    .ELSEIF(op=='-')
        mov bl, val1
        sub bl, val2
        mov byte ptr res, bl
    .ELSEIF(op=='*')
        mov al, val1
        mul val2
        ;in al product moves to ax
        mov res, ax
    .ELSEIF(op=='/')
        movzx ax, val1
        div val2
        mov byte ptr res, al
    .ELSEIF(op=='%')
        movzx ax, val1
        div val2
        mov byte ptr res, ah
    .ELSE
        mov edx, offset error2
        call crlf
        call WriteString
        jmp quit
    .ENDIF
    call crlf
    mov edx, offset result
    call WriteString
    movzx eax, res
    call WriteDec
quit:
    call crlf
    call WaitMsg
    exit

main ENDP

ValidateInput PROC
    validate:
        .IF(eax >= 0 && eax <= 9)
            jmp quit
        .ENDIF
    BadInput:
        mov edx, offset error
        call WriteString
        call ReadInt
        jmp validate
    quit:
        ret
ValidateInput ENDP

END main

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