Answer to Question #284830 in Assembler for Ahmed Ali

Question

1) Write a program in assembly language to the handle following cases.

The program takes a character input.

Enter any character From A-Z :

• If the user enters an uppercase alphabet simply show the message “This is upper case letter”
• If the user enters a lowercase alphabet, then simply show the message “This is lower case letter”
• If the user enters any other character its shows the wrong input.

Answer 1

INCLUDE Irvine32.inc

.data
msgEnter    BYTE "Enter char: ",0
msgWrong    BYTE 10,"The wrong input",0
msgUpper    BYTE 10,"This is upper case letter",0
msgLower    BYTE 10,"This is lower case letter",0

.code
main PROC
   mov edx, OFFSET msgEnter        ; address of string msgEnter
   call writeString                ; writes a string "Enter char: "
   call ReadChar
   call writeChar

; Check char
   cmp al,'A'
   jl _wrong            ; char < A
   cmp al,'z'
   jg _wrong            ; char > z
   cmp al,'Z'
   jg nextCheck        ; Z > char < a
   jmp displayMsg    

nextCheck:    
    cmp al, 'a'    
    jl  _wrong    ; Z < char < a

displayMsg:
; al = char
    cmp al, 'a'
    jge displayLow
;************************************
   mov edx, OFFSET msgUpper        ; address of string  
   call writeString                ; writes a string
   jmp _quit

displayLow:
   mov edx, OFFSET msgLower        ; address of string  
   call writeString                ; writes a string
   jmp _quit

 _wrong:
   mov edx, OFFSET msgWrong        ; address of string msgEnter
   call writeString                ; writes a string "The wr   "

 _quit:
     call    crlf                ; new string    
    call    crlf                ; new string
    exit
main ENDP
END main