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%include "io64.inc"
 
section .text
global CMAIN
CMAIN:
    mov rbp, rsp; for correct debugging
 
    GET_DEC 1, al           
    GET_DEC 1, num
    
    PRINT_DEC 1, al
    NEWLINE
    PRINT_DEC 1, num
                                    
                                                                                                                                                                                        
    ; 더하기 연산
    ; add a, b (a = a + b)
    ; a는 레지스터 or 메모리
    ; b는 레지스터 or 메모리 or 상수
    ; 단! a, b 모두 메모리는 x
    
    ; 빼기 연산
    ; sub a, b (a = a - b)
    
    add al, 1  ;레지스터+상수
    PRINT_DEC 1, al   ;1+1=2
    NEWLINE
    
    add al, [num] ;레지스터+메모리
    PRINT_DEC 1, al  ;2+2=4
    NEWLINE
    
    mov bl, 3 ;레지스터+레지스터
    add al, bl  ;4+3=7
    PRINT_DEC 1, al
    NEWLINE
    
    add [num], byte 1 ;메모리+상수
    PRINT_DEC 1 , [num]  ;2+1=3
    NEWLINE
 
    add [num], al ;메모리+상수
    PRINT_DEC 1 , [num] ;3+7=10
    NEWLINE           
 
    ; 곱하기 연산
    ; mul reg
    ; mul bl => al * bl
    ; 연산 결과를 ax에 저장
    ; mul bx => ax * bx
    ; 연산 결과는 ,dx(상위16비트) ax(하위16비트)에 저장
    ; mul ebx => eax * ebx
    
    ; ex) 5 * 8 은?
    mov ax, 0
    mov al, 5
    mov bl, 8
    mul bl
    PRINT_DEC 2, ax
    NEWLINE
    
    ; 나누기 연산
    ; div reg
    ; div bl => ax / bl
    ; 연산 결과는 al (몫) ah (나머지)
    
    ; ex) 100 / 3은?
    mov ax, 100
    mov bl, 3
    div bl
    PRINT)DEC 1, al  ;100 / 3 = 33 * 3 + 1
    NEWLINE
    mov al, ah
    PRINT_DEC 1, al
    
 
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
    xor rax, rax
    ret
    
    ; 초기와 된 데이터
    ; [변수이름] [크기] [초기값]
    ; [크기] db(1) dw(2) dd(4) dq(8)
  
;section .data
   
    ; 초기화 되지 않은 데이터
    ;[변수이름] [크기] [개수]`
    ;[크기] resb(1) resw(2) resd(4) resq(8)
 
 section .bss
    num resb 1
    
 cs

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