Assignment: Calculator Description: addition (+), subtraction (-), multiplicatio

Question

Assignment: Calculator Description: addition (+), subtraction (-), multiplication (*), integer division (/), modulo division (%), and Write a calculator program in assembly. It should handle the following functions exponentiation (^). Your program should... 1. Read an integer from the user 2. Read a character from the user, representing the function. (+,-, *, /, % 3. Read another integer from the user. 4. Print an equals sign () 5. Print the result Please comment your code, and format it so that it looks clean! (examples on next page) Output Examples: andrew@dev:~/calculator$ ./calculator 17 This is input - This is input ? This is input - This is output - This is output 28 andrew@dev/calculator$ ./calculator 25 74 andrew@dev:~/calculator$./calculator 10 110

Explanation / Answer

.model small
.stack 100h

.data
msg1 db 13,10,13,10, "Enter 1st Number : $"
msg2 db 13,10, "Enter 2nd Number : $"
msgEr db 13,10, "Error $"
msgCh db 13,10, "Press A to ADD , S to SUBTRACT ,D to MULTIPLY, F to DIVIDE, X to EXIT : $ "
msgSum db 13,10,13,10, "Sum is : $"
msgDif db 13,10,13,10, "Difference is : $"
msgDiv db 13,10,13,10, "Quotient is : $"
msgMul db 13,10,13,10, "Product is : $"
tmp db ?

.code

start:
mov ax, @data
mov ds, ax

lea dx, msg1
mov ah, 09h
int 21h
mov bx, 0

start1:
mov ah, 01h
int 21h
cmp al,0dh   
je next1
mov ah,0   
sub al,30h   
push ax
mov ax,10d   
mul bx   
pop bx   
add bx,ax
jmp start1   

next1:
push bx
lea dx,msg2
mov ah,09h
int 21h

mov bx,0

start2:
mov ah,01h
int 21h
cmp al,0dh
je choice
mov ah,0
sub al,30h
push ax
mov ax,10d
mul bx
pop bx
add bx,ax
jmp start2

choice:
lea dx, msgCh
mov ah, 09h
int 21h

mov ah, 01h
mov answer, al
int 21h

cmp al,'f'
je dividing

cmp al,'a'  
je adding

cmp al,'s'
je subtracting

cmp al,'d'
je multiplying

cmp al,'x'
mov ah, 4ch
int 21h

error:
lea dx,msgEr
mov ah,09h
int 21h
jmp start

dividing:
pop ax
div bx
push ax
lea dx,msgDiv
mov ah,09h
int 21h
pop ax
mov cx,0
mov dx,0
mov bx,10d
jmp break

adding:
pop ax
add ax,bx
push ax
lea dx,msgSum
mov ah,09h
int 21h
pop ax
mov cx,0
mov dx,0
mov bx,10d
jmp break

multiplying:
pop ax
mul bx   
push ax
lea dx,msgMul
mov ah,09h
int 21h
pop ax
mov cx,0
mov dx,0
mov bx,10d
jmp break

subtracting:
pop ax
sub ax,bx
push ax
lea dx,msgDif
mov ah,09h
int 21h
pop ax
mov cx,0
mov dx,0
mov bx,10d

break:
div bx
push dx
mov dx,0
inc cx
or ax,ax
jne break

ans:   
pop dx
add dl,30h
mov ah,02h
int 21h
loop ans

jmp start

end start

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