Assignment_7

section .data
arr dq 000000000000004h,0000000000000003h
n equ 2
menu db 10d,13d,"MENU"
db 10d,13d,"1. Addition"
db 10d,13d,"2. Subtraction"
db 10d,13d,"3. Multiplication"
db 10d,13d,"4. Division"
db 10d,13d,"5. Exit"
db 10d,13d,"Enter your Choice: "
menu_len equ $-menu m1 db 10d,13d,"Addition: " l1 equ$-m1
m2 db 10d,13d,"Substraction: "
l2 equ $-m2 m3 db 10d,13d,"Multiplication: " l3 equ$-m3
m4 db 10d,13d,"Division: "
l4 equ $-m4

%macro scall 4
mov rax,%1
mov rdi,%2
mov rsi,%3
mov rdx,%4
syscall
%endmacro

section .bss
answer resb 16 ;to store the result of operation
choice resb 2

section .text
global _start:
_start:
up: scall 1,1,menu,menu_len
scall 0,0,choice,2
cmp byte[choice],"1"
je case1
cmp byte[choice],"2"
je case2
cmp byte[choice],"3"
je case3
cmp byte[choice],"4"
je case4
cmp byte[choice],"5"
je case5

	case1: 
		scall 1,1,m1,l1
		call addition
		jmp up
		
	case2: 
		scall 1,1,m2,l2
		call substraction
		jmp up
	case3: 
		scall 1,1,m3,l3
		call multiplication
		jmp up
	case4: 
		scall 1,1,m4,l4
		call division
		jmp up
	case5: 
		mov rax,60
		mov rdi,0
		syscall

	;procedures for arithmetic and logical operations
	addition:
		mov rcx,n
		dec rcx
		mov rsi,arr
		mov rax,[rsi]
		up1: 
			add rsi,8
			mov rbx,[rsi]
			add rax,rbx
			loop up1
		call display
	ret

	substraction:
		mov rcx,n
		dec rcx
		mov rsi,arr
		mov rax,[rsi]
		up2: 
			add rsi,8
			mov rbx,[rsi]
			sub rax,rbx
			loop up2
		call display
	ret
	
	multiplication:
		mov rcx,n
		dec rcx
		mov rsi,arr
		mov rax,[rsi]
		up3: 
			add rsi,8
			mov rbx,[rsi]
			mul rbx
			loop up3
		call display
	ret
	
	division:
		mov rcx,n
		dec rcx
		mov rsi,arr
		mov rax,[rsi]
		up4: 
			add rsi,8
			mov rbx,[rsi]
			mov rdx,0
			div rbx
			loop up4
		call display
	ret
	
	display:
		mov rsi,answer+15
		mov rcx,16
		cnt: 
			mov rdx,0
			mov rbx,16
			div rbx
			cmp dl,09h
			jbe add30
			add dl,07h
		add30: 
			add dl,30h
		mov [rsi],dl
		dec rsi
		dec rcx
		jnz cnt
		scall 1,1,answer,16
	ret