Program that reads a character from keyboard and determines whether the character is a vowel or consonant.

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UNIVERSITY OF THE PUNJAB

Third Semester 2015

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 a character from keyboard and determines whether the character is a vowel or consonant. Your program should display proper message.

Solution:

INCLUDE Irvine32.inc

.data
msg BYTE "Enter an alphabet : ",0
error BYTE "Wrong Input!, Please enter an alphabet : ",0
msgV BYTE "Character is a vowel!", 0
msgC BYTE "Character is a consonant!", 0
input BYTE ?
.code
main PROC
    mov edx, offset msg
    call WriteString
    call ReadChar
    call ValidateInput
    call WriteChar
    mov input, al
    call crlf

    .IF(input=='a'||input=='e'||input=='i'||input=='o'||input=='u')
        mov edx, offset msgV
        call WriteString
    .ELSEIF(input=='A'||input=='E'||input=='I'||input=='O'||input=='U')
        mov edx, offset msgV
        call WriteString
    .ELSE
        mov edx, offset msgC
        call WriteString
    .ENDIF

quit:
    call crlf
    call WaitMsg
    exit

main ENDP

ValidateInput PROC
    validate:
        .IF(al >= 'a' && al <= 'z')
            jmp quit
        .ELSEIF(al >='A' && al <= 'Z')
            jmp quit
        .ENDIF
    BadInput:
        call crlf
        mov edx, offset error
        call WriteString
        call ReadChar
        jmp validate
    quit:
        ret
ValidateInput ENDP

END main

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