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Assembly Program to check whether the input number is Even or Odd

January 20, 2020

The program prompts the user to input a number and tells whether the input number is Even or Odd. The program can take a multidigit number as input.

 The basic logic in the program is that after taking the number from the user, the program RCR (Rotate Carry Right) the number by one. After the execution of this command, the least significant bit moves in the carry flag. If now the carry flag is 1 it means the number is Odd otherwise the number is Even.

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.MODEL SMALL
.STACK 100H
.DATA
MSG DB "ENTER A NUMBER: $"
EVENMSG DB 0DH, 0AH, "NUMBER IS EVEN $" 
ODDMSG DB 0DH, 0AH, "NUMBER IS ODD $"
TOTAL DB 0
VALUE DB 0
.CODE
MAIN PROC
    
    MOV AX, @DATA
    MOV DS, AX
    
    MOV AH, 9
    LEA DX, MSG
    INT 21H
    
    READ:
    MOV AH, 1
    INT 21H
    
    CMP AL, 13
    JE ENDOFNUMBER
    
    MOV VALUE, AL
    SUB VALUE, 48
    
    MOV AL, TOTAL
    MOV BL, 10
    MUL BL
    
    ADD AL, VALUE
    
    MOV TOTAL, AL
    
    JMP READ
    
    ENDOFNUMBER:
    
    MOV AL, TOTAL
    RCR AL, 1
    JC ODD
    
    MOV AH, 9
    LEA DX, EVENMSG
    INT 21H
    
    JMP EXIT
    
    ODD:
    
    MOV AH, 9
    LEA DX, ODDMSG
    INT 21H
    
    EXIT:   

MAIN ENDP

Output:



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