汇编实现从键盘输入一个带符号字节数据(如-56)存入内存,并将结果在显示器上以十进制形式显示输出。
时间: 2024-05-06 13:21:36 浏览: 14
好的,我可以为您提供一份汇编代码来实现您的要求:
```
org 0x100
section .data
input_message db 'Please enter a signed byte value: '
output_message db 'The decimal value you entered is: '
section .bss
input_value resb 1
section .text
mov ah, 0x0e ; BIOS interrupt for printing a character
loop:
mov al, [input_message + cx] ; Print the input message
cmp al, 0
je read_input
int 0x10
inc cx
jmp loop
read_input:
mov ah, 0 ; BIOS interrupt for reading keyboard input
int 0x16 ; Wait for user to enter input
mov [input_value], al ; Store the input value in memory
neg al ; Negate the value to make it signed
mov bl, al ; Save the signed value in BL register
mov ax, 0 ; Clear the AX register
mov cx, 10 ; Set the CX register to 10 for decimal conversion
div cx ; Divide AX by CX to get the quotient in AL and remainder in AH
mov cl, ah ; Move the remainder to the CL register
add cl, '0' ; Convert the remainder to ASCII character
mov dl, al ; Move the quotient to the DL register
cmp dl, 0
jz print_output
add dl, '0' ; Convert the quotient to ASCII character
push dx ; Push quotient and remainder onto the stack
jmp div_loop
div_loop:
pop dx
int 0x10 ; Print the quotient and remainder
cmp sp, 0
jne div_loop
print_output:
mov cx, 0
loop2:
mov al, [output_message + cx] ; Print the output message
cmp al, 0
je exit_program
int 0x10
inc cx
jmp loop2
exit_program:
ret
```
这段汇编代码会在显示器上提示用户输入一个带符号字节数据,并将用户输入的值存储在内存中。然后,它会将该值转换为十进制形式并在屏幕上输出。注意,这段代码只适用于8086处理器,可能需要进行适当的修改才能在其他处理器上运行。