CODE

EVEN ODD

.MODEL SMALL
.STACK 100H 
.DATA

MSG DB 10, 13, "ENTER A POSITIVE NUMBER: $"
MSG1 DB 10,13, "THE NUMBER IS EVEN $"
MSG2 DB 10, 13,  "THE NUMBER IS ODD $"


.CODE
MAIN PROC 
MOV AX, @DATA
MOV DS, AX

LEA DX, MSG
MOV AH, 09H 
INT 21H 

MOV AH, 01H
INT 21H 

CHECK:
MOV DL, 2
DIV DL 

CMP AH, 0
JNE ODD

EVEN: 
LEA DX, MSG1
MOV AH, 09H
INT 21H 
JMP EXIT 

ODD:
LEA DX, MSG2
MOV AH, 09H 
INT 21H 

EXIT: 
MOV AH, 4CH
INT 21H 

MAIN ENDP
END MAIN

LOOP: PRINT 0-9 OR 9-0

.MODEL SMALL
.STACK  100H
.DATA
MSG DB "PRINT DIGITS FROM 0 TO 9: $"
.CODE
MAIN PROC
    MOV AX,@DATA
    MOV DS,AX

    LEA DX,MSG 
    MOV AH,9
    INT 21H  

    MOV CX,10
    MOV DL,48

PRINT:
    MOV AH,2
    INT 21H
    INC DL
    LOOP PRINT

    MOV AH,4CH
    INT 21H

MAIN ENDP
END MAIN

UPPER CASE TO LOWER CASE

.MODEL SMALL
 .STACK 100H
 .DATA
 
 MSG1 DB "ENTER A UPPERCASE LETTER: $"
 MSG2 DB 10,13, "IN LOWERCASE LETTER: $"
 
 CHAR DB ?
 .CODE
 
 MAIN PROC
    MOV AX,@DATA
    MOV DS,AX   
    
    ;IT IS CONVERT FROM UPPERCASE TO LOWERCASE
              
    LEA DX,MSG1
    MOV AH,9
    INT 21H
    
    MOV AH,1
    INT 21H
    
    ADD AL,32
    MOV CHAR,AL
    
    LEA DX,MSG2
    MOV AH,9
    INT 21H  
    
    MOV DL,CHAR
    MOV AH,2
    INT 21H
    
    MOV AH,4CH
    INT 21H
    MAIN ENDP
 END MAIN

ADDITION:

.MODEL SMALL
.STACK 100H
.DATA
MSG1 DB 10, 13, "ENTER 1ST NUMBER: $"
MSG2 DB 10, 13, "ENTER 2ND NUMBER: $"
SUM DB, 10, 13, "SUMMATION IS: $"

N1 DB ?
N2 DB ?
R DB ?


.CODE
MAIN PROC

    MOV AX, @DATA
    MOV DS, AX

    LEA DX, MSG1
    MOV AH, 09H
    INT 21h

    MOV AH, 1
    INT 21H 

    SUB AL, 48
    MOV N1, AL

    LEA DX, MSG2
    MOV AH, 09H
    INT 21h

    MOV AH, 1
    INT 21H 

    SUB AL, 48
    MOV N2, AL



    MOV AL, N1
    ADD AL, N2
    MOV R, AL
    MOV AH, 0


    AAA
    ADD AH, 48
    ADD AL, 48
    MOV BX, AX

    LEA DX, SUM
    MOV AH, 9
    INT 21H

    MOV AH, 2
    MOV DL, BH
    INT 21H

    MOV AH, 2
    MOV DL, BL
    INT 21H



    MOV AH, 4CH
    INT 21h

MAIN ENDP
END MAIN

MULTIPLICATION

.MODEL SMALL
.STACK 100H
.DATA
M1 DB 'ENTER YOUR FIRST DIGIT: $'
M2 DB 10,13,'ENTER YOUR SECOND DIGIT: $'
M3 DB 10,13,'THE RESULT IS: $'

N1 DB ?
N2 DB ?
RES DB ? 

.CODE

MAIN PROC
    MOV AX,@DATA
    MOV DS,AX
    
    
    LEA DX,M1
    MOV AH,9
    INT 21H
    
    MOV AH,1
    INT 21H
    SUB AL,48
    MOV N1,AL  
    
    LEA DX,M2
    MOV AH,9
    INT 21H
    
    MOV AH,1
    INT 21H
    SUB AL,48
    MOV N2,AL  
    
    MOV AL,N1
    MUL N2
    
    MOV RES,AL
    MOV AH,0
    
    AAM
    
    ADD AH,48
    ADD AL,48  
       
       
     MOV BX,AX
    
    LEA DX,M3
    MOV AH,9
    INT 21H
    
   
    
    MOV AH,2
    MOV DL,BH
    INT 21H  
    
    MOV AH,2
    MOV DL,BL
    INT 21H
    
    
    
       ;EXIT
    MOV AH,4CH
    INT 21H    
    MAIN ENDP
END MAIN