用汇编语言写一个计算器

好的，下面是一个简单的计算器汇编代码，它可以进行加、减、乘、除四种基本运算：

section .data
    prompt db "Enter an operation (+, -, *, /): ", 0
    num1_prompt db "Enter the first number: ", 0
    num2_prompt db "Enter the second number: ", 0
    result_prompt db "Result: ", 0
    error_msg db "Error: division by zero", 0
    
section .bss
    num1 resb 2
    num2 resb 2
    result resb 2

section .text
    global _start
    
_start:
    ; print prompt for operation
    mov eax, 4
    mov ebx, 1
    mov ecx, prompt
    mov edx, 30
    int 0x80
    
    ; read operation from user input
    mov eax, 3
    mov ebx, 0
    mov ecx, num1
    mov edx, 2
    int 0x80
    
    ; print prompt for first number
    mov eax, 4
    mov ebx, 1
    mov ecx, num1_prompt
    mov edx, 20
    int 0x80
    
    ; read first number from user input
    mov eax, 3
    mov ebx, 0
    mov ecx, num1
    mov edx, 2
    int 0x80
    
    ; print prompt for second number
    mov eax, 4
    mov ebx, 1
    mov ecx, num2_prompt
    mov edx, 21
    int 0x80
    
    ; read second number from user input
    mov eax, 3
    mov ebx, 0
    mov ecx, num2
    mov edx, 2
    int 0x80
    
    ; convert numbers from ASCII to binary
    mov al, [num1]
    sub al, 0x30
    mov bl, [num2]
    sub bl, 0x30
    
    ; perform operation
    cmp byte [num1], '+'
    je add_numbers
    cmp byte [num1], '-'
    je subtract_numbers
    cmp byte [num1], '*'
    je multiply_numbers
    cmp byte [num1], '/'
    je divide_numbers
    
    ; handle invalid operation
    mov eax, 4
    mov ebx, 1
    mov ecx, error_msg
    mov edx, 21
    int 0x80
    jmp exit_program
    
add_numbers:
    add al, bl
    jmp print_result
    
subtract_numbers:
    sub al, bl
    jmp print_result
    
multiply_numbers:
    mul bl
    jmp print_result
    
divide_numbers:
    cmp bl, 0
    je division_by_zero
    div bl
    jmp print_result
    
division_by_zero:
    ; handle division by zero
    mov eax, 4
    mov ebx, 1
    mov ecx, error_msg
    mov edx, 21
    int 0x80
    jmp exit_program
    
print_result:
    ; convert result from binary to ASCII
    add al, 0x30
    mov [result], al
    
    ; print result
    mov eax, 4
    mov ebx, 1
    mov ecx, result_prompt
    mov edx, 8
    int 0x80
    
    mov eax, 4
    mov ebx, 1
    mov ecx, result
    mov edx, 2
    int 0x80
    
exit_program:
    ; exit program
    mov eax, 1
    xor ebx, ebx
    int 0x80

这段代码使用了 `int 0x80` 作为系统调用来读取用户输入和输出结果。该计算器支持的数字位数为两位，如果需要扩展，需要修改 `.bss` 段和相关代码。