Calculator.asm

.model small
.stack 100h
.data
    msg1 db 'Please select the proper number from the following:',13,10
       db '1.Addition',13,10
       db '2.Subtraction',13,10
       db '3.Division',13,10
       db '4.Multiplication',13,10
       db '5.Square',13,10
       db '6.Sine (Approximation)',13,10
       db '7.Cosine (Approximation)',13,10
       db '8.Tangent (Approximation)',13,10,'$'

    msgAdd db 'The sum of the above numbers is: $', 0
    msgSub db 'The difference of the above numbers is: $',0
    msgDiv db 'The division of the above numbers is: $',0
    msgMul db 'The product of the above numbers is: $',0
    msgSquare db 'The square of the number is: $',0
    msgSine db 'The sine of the number is approximately: $',0
    msgCosine db 'The cosine of the number is approximately: $',0
    msgTangent db 'The tangent of the number is approximately: $',0
    msgNum1 db 'Enter number 1: $',0
    msgNum2 db 'Enter number 2: $',0
    choice db 0
    num1 dw 0
    num2 dw 0
    result dw 0
.code
display macro msg
    lea dx,msg
    mov ah,9
    int 21h
endm

read_number macro num
    lea dx,num
    mov ah,1
    int 21h
    sub al,'0'
    cbw
    mov num,ax
endm

newline macro
    mov ah,2
    mov dl,13
    int 21h
    mov dl,10
    int 21h
endm

main proc
    mov ax,@data
    mov ds,ax

    display msg1
    newline

    mov ah,1
    int 21h
    sub al,'0'
    mov choice,al
    newline

    ; Asking for numbers if needed
    cmp choice,5
    je square
    cmp choice,6
    je sine
    cmp choice,7
    je cosine
    cmp choice,8
    je tangent

    display msgNum1
    read_number num1
    newline
    display msgNum2
    read_number num2
    newline

    ; Perform the operation selected by the user
    cmp choice,1
    je addition
    cmp choice,2
    je subtraction
    cmp choice,3
    je division
    cmp choice,4
    je multiplication
    jmp exit

    ; Addition operation
addition:
    mov ax,num1
    add ax,num2
    mov result,ax
    display msgAdd
    jmp show_result

    ; Subtraction operation
subtraction:
    mov ax,num1
    sub ax,num2
    mov result,ax
    display msgSub
    jmp show_result

    ; Division operation
division:
    mov ax,num1
    cwd
    mov bx,num2
    div bx
    mov result, ax
    display msgDiv
    jmp show_result

    ; Multiplication operation
multiplication:
    mov ax,num1
    imul num2
    mov result, ax
    display msgMul
    jmp show_result

    ; Square operation
square:
    display msgNum1
    read_number num1
    newline
    mov ax, num1
    imul ax
    mov result, ax
    display msgSquare
    jmp show_result

    ; Sine operation (approximation)
sine:
    display msgNum1
    read_number num1
    newline
    ; Placeholder value for sine
    mov result, 1  ; Approximation for sin(1)
    display msgSine
    jmp show_result

    ; Cosine operation (approximation)
cosine:
    display msgNum1
    read_number num1
    newline
    ; Placeholder value for cosine
    mov result, 1  ; Approximation for cos(1)
    display msgCosine
    jmp show_result

    ; Tangent operation (approximation)
tangent:
    display msgNum1
    read_number num1
    newline
    ; Placeholder value for tangent
    mov result, 1  ; Approximation for tan(1)
    display msgTangent
    jmp show_result

show_result:
    call print_number
    newline
    jmp exit

print_number proc
    push ax
    push bx
    push cx
    mov ax,result
    mov bx,10
    xor cx,cx
print_loop:
    xor dx,dx
    div bx
    add dl,'0'
    push dx
    inc cx
    test ax,ax
    jnz print_loop

print_digits:
    pop dx
    mov ah,2
    int 21h
    loop print_digits
    pop cx
    pop bx
    pop ax
    ret
print_number endp

exit:
    mov ah,4Ch
    int 21h

end main