使用 printf asm nasm 在一行上打印整个数组 [英] Printing an entire array on a single line using printf asm nasm

问题描述

我正在使用 NASM 来编译我的 ASM 程序，但我无法弄清楚如何使用循环在一行上打印整个数组(不一定知道数组有多大).每当我用 printf 创建一个循环时，它都会在多行而不是一行上打印值.知道如何使 printf 使用循环在一行上打印数组的多个值吗?我得到值 1-9 但都在不同的行而不是同一行.这是在不使用除 printf c 库之外的外部库的情况下完成的.非常感激任何的帮助.我的代码如下.

I am using NASM for compiling my ASM program and I am having trouble figuring out how to print an entire array on a single line (without necessarily knowing how big the array is) using a loop. Whenever I create a loop with printf it prints the values on multiple lines instead of one line. Any idea how to make printf print multiple values of an array on a single line using a loop? I get values 1-9 but all on a different line instead of the same line. This is to be done without using external libraries other than: the printf c library. Any help would be most appreciated. The code I have is below.

  extern    printf  

 SECTION .data              ; Data section, initialized variables

array: dd 1, 2, 3, 4, 5, 6, 7, 8, 9, 0; this is a test array for testing purposes

arrayLen: dd 9  ; length of array 

aoutput: db "%d", 10, 0 ; output format

SECTION .text               ; Code section.

global main             ; the standard gcc entry point

main:                   ; the program label for the entry point
    push    ebp         ; set up stack frame
    mov     ebp,esp

    mov ecx, [arrayLen] ; loop counter set up
    mov esi, 0      ; counter to increment set up for looping through array
.loop:

    push ecx                                    ; make sure to put ecx (counter) on stack so we don't lose it when calling printf)
    push dword [array + esi]                    ; put the value of the array at this (esi) index on the stack to be used by printf
    push dword aoutput                          ; put the array output format on the stack for printf to use
    call printf                                 ; call the printf command
    add esp, 8                                  ; add 4 bytes * 2
    pop ecx                                     ; get ecx back

    add esi, 4
    loop .loop

    mov     esp, ebp    ; takedown stack frame
    pop     ebp         ; same as "leave" op

    mov     eax,0       ; normal, no error, return value
    ret                 ; return

推荐答案

唯一决定某事是打印在单行还是多行的，是打印换行符 (\n) 与否.

The only thing that determines whether something is printed on a single line or multiple, is if you print a newline character (\n) or not.

这里，当您说 10 时，它是换行符的 ASCII 值.如果你改变这个:

Here, when you say 10, that is the ASCII value for a Line Feed. If you change this:

aoutput: db "%d", 10, 0 

为此:

aoutput: db "%d ", 0 

您的值将由空格分隔，而不是由换行符分隔.

your values will be separated by spaces, instead of by new lines.

在序列中的最后一个值之后，可以打印一个单独的换行符:

After the final value in the sequence, you can print a lone newline character:

push 0x0A     ; New line character
call putchar

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