extern printf
    extern scanf

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;;; TEXT ;;;
;;;;;;;;;;;;
    section .text
    global main
main:
    sub rsp, 8

    xor rcx, rcx

.loop:
    lea rdi, [rel format]
    lea rsi, [rel operation]
    lea rdx, [rel count]
    xor ax, ax
    call scanf

    xor rax, rax
    mov eax, [rel count]
    cmp byte [rel operation], '+'
    je .add
    neg rax
.add:
    add rcx, rax

    push rcx
    lea rdi, [rel message]
    mov rsi, rcx
    xor ax, ax
    call printf
    pop rcx

    jmp .loop


    add rsp, 8
    ret

;;;;;;;;;;;;
;;; DATA ;;;
;;;;;;;;;;;;
    section .data
format: db "%c%d",0
message: db "%d",10,0

    section .bss
buffer:     resb 64
operation:  resb 1
count:      resb 4