需要帮助使用 Visual Studio .asm 文件以汇编语言显示带小数位的数字 [英] Need help to display number with decimal places in assembly language using visual studio .asm file

问题描述

需要帮助使用 Visual Studio .asm 文件以汇编语言显示带小数位的数字.
例如，10 除以 4 将是 2.5 但它只显示 2

Need help to display number with decimal places in assembly language using visual studio .asm file.
For instance, 10 divide 4 will be 2.5 but it only displays 2

mov eax, 10
mov ebx, 4
xor edx, edx
div ebx
call WriteDec

推荐答案

DIV 提供整数商和余数作为结果.根据余数，您可以通过乘以 10 并除以除数来构造小数点后的整数:

DIV offers as result both the integer quotient and the remainder. From the remainder you can construct an integer number after the decimal point by multiplying it by 10 and dividing it by the divisor:

INCLUDE Irvine32.inc

.CODE

main PROC
    mov eax, 10             ; Dividend
    mov ebx, 4              ; Divisor
    xor edx, edx            ; High 32 bit of dividend
    div ebx                 ; Result: EAX, remainder in EDX
    call WriteDec           ; http://programming.msjc.edu/asm/help/index.html?page=source%2Firvinelib%2Fwritedec.htm

    mov al, '.'             ; Decimal point
    call WriteChar          ; http://programming.msjc.edu/asm/help/index.html?page=source%2Firvinelib%2Fwritechar.htm

    imul eax, edx, 10       ; EAX = EDX * 10 i.e. New dividend = Old remainder * 10
    xor edx, edx            ; Clear the high part of dividend
    div ebx                 ; EAX rem. EDX = EDX:EAX / EBX
    call WriteDec           ; http://programming.msjc.edu/asm/help/index.html?page=source%2Firvinelib%2Fwritedec.htm

    exit
main ENDP

END main

根据所需的小数位数，您可以重复此过程.

Depending on the desired number of decimal places, you can repeat this procedure.

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