Program that reads five numbers from keyboard and then displays the maximum and minimum number on the screen.

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UNIVERSITY OF THE PUNJAB

Third Semester 2014

Examination: B.S. 4 Years Programme 

Paper: Computer Organization and Assembly Language

Course Code: IT-203 / 21402

Question # 3:

Write an assembly language program that reads five numbers from keyboard and then displays the maximum and minimum number on the screen. Your program should implement proper checks that only a number can be input.

Solution:

INCLUDE Irvine32.inc

count=5
.data
msg BYTE "Enter a number : ",0
error BYTE "Wrong Input!, Please enter a number : ",0
msgMin BYTE "Minimum integer is : ",0
msgMax BYTE "Maximum integer is : ",0
array DWORD count DUP(?)
.code
main PROC
    mov esi, offset array
    mov ecx, count
    L1:
        mov edx, offset msg
        call WriteString
        call ReadInt
        call ValidateInput
        mov [esi], eax
        add esi, 4
    loop L1

    mov ecx, count
    mov esi, offset array
    mov eax, [esi]            ;minimum in eax
    mov ebx, [esi]            ;minimum in ebx
    L2:
        .IF([esi]<eax)
            mov eax, [esi]
        .ELSEIF([esi]>ebx)
            mov ebx, [esi]
        .ENDIF
        add esi, 4
    loop L2

    mov edx, offset msgMin
    call WriteString
    call WriteDec

    call crlf
    mov edx, offset msgMax
    call WriteString
    mov eax, ebx
    call WriteDec
quit:
    call crlf
    call WaitMsg
    exit

main ENDP

ValidateInput PROC
    validate:
        jno next
    next:
        jns quit
    BadInput:
        mov edx, offset error
        call WriteString
        call ReadInt
        jmp validate
    quit:
    ret
ValidateInput ENDP

END main

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