China DOS Union

```code
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: ::
:: nd.bat ::
:: ::
:: by Shilyx mailto oversleep@163.com (C)2006.9.4 ::
:: ::
:: Batch program to convert a fraction to a decimal, supports infinite decimals, and the repeating part is enclosed in brackets ::
:: ::
:: Usage: Enter at the command line in the following format: nd a b ::
:: where parameter a represents the numerator and parameter b represents the denominator ::
:: You can also run it directly without parameters, and the program will prompt for input ::
:: ::
:: Note: The program runs in the script environment. It is slow for large denominators, generally do not exceed 3000 ::
:: ::
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

@echo off
setlocal EnableDelayedExpansion

if "%2"=="" goto input
set /A N=%1
set /A D=%2
goto compute

:input
echo Input N:
set /p NN=
set /A N=%NN%
echo Input D:
set /p DD=
set /A D=%DD%
goto compute

:compute
if %N%==0 echo Wrong Input && goto input
if %D%==0 echo Wrong Input && goto input
set str=

for /L %%a in (1,1,%D%) do @set /A Left%%a=0
for /L %%a in (1,1,%D%) do @set /A Result%%a=0
set /A int_part="%N%/%D%"
set /A N="%N%%%%D%"
set /A tool=%N%
if %tool%==0 echo The result of expression "%N%/%D%" is %int_part% && goto :EOF
set /A turn=1

:start
set /A "tool*=10"
set /A Result%turn%="%tool%/%D%"
set /A Left="%tool%%%%%D%"
if %Left%==0 set /A begin=-1 && set /A end="%turn%" && goto endCompute
if %Left%==%N% set /A begin=0 && set /A end="%turn%" && goto endCompute
if not "!Left%Left%!"=="" set /A begin="!Left%Left%!" && set /A end="%turn%" && goto endCompute

set /A Left%Left%=%turn%
set /A tool=%Left%
set /A "turn+=1"
goto start

:endCompute
if "%3"=="" echo The result of expression "%N%/%D%" is
set result=#
for /L %%i in (1,1,%end%) do @set result=!result!!Result%%i!
set result=%result:~1%
if %begin%==-1 echo %int_part%.%result% && goto end
if %begin%==0 echo %int_part%. && goto end
echo %int_part%.!result:~0,%begin%!

:end
if "%2"=="" echo. && echo Press any key to quit application && pause>nul

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::
:: The return value of begin has certain meanings: ::
:: -1: Indicates that the division has been successfully completed, and it can be output directly ::
:: 0: Indicates that the new remainder is one, returning directly to the start ::
:: Other: Indicates that it is the most common number, with a neck before the repeating part ::
:: int_part represents the integer part of the result ::
:: tool is an iterative variable, and it is the one working all the time ::
:: turn is the index value, indicating the current position of the array ::
:: Two arrays are used in the program for statistical purposes ::
:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

The part enclosed in square brackets is the loop body.


[ Last edited by my3439955 on 2007-4-23 at 02:19 AM ]

First, give some encouragement;

This is a bug; try using 25/5;
The result of the expression "0/5" is 5;

The dividend cannot be greater than 10^9

The following link is one I wrote before:
The dividend and the result can theoretically be of unlimited digits;

You can decide the number of digits you want to be precise to; the last digit is rounded;

However, the problem of the divisor being greater than 10^9 is not solved; the LZ can try to break through this.

http://www.cn-dos.net/forum/viewthread.php?tid=29097&fpage=1&highlight=BJSH&page=2
This is on the 26th floor

Your code is very good. Adding a judgment loop seems to make it unnecessary to care about the number of digits, because it will definitely cycle after a certain number of digits. When the divisor is N, this number of digits is at most N - 1

Whether the divisor or the dividend is zero, the result is obvious, so it is classified as incorrect input, and 0/5 is required to re-enter.

There is a small problem with 25/5, and the problem is in this line:
if %tool%==0 echo The result of expression "%N%/%D%" is %int_part% && goto :EOF
Here, after judging the exact division, there is no pause with pause and it exits directly.
It should change goto :EOF to goto :end
%N% should be changed to %NN%
The code for processing parameters also needs to be changed.
The modified code is as follows

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

::                                                                                         ::

::               nd.bat                                                                    ::

::                                                                                         ::

::               by Shilyx         mailto oversleep@163.com        (C)2006.9.4             ::

::                                                                                         ::

::               Batch program to convert fractions to decimals, supports infinite decimals, and the loop body is enclosed in square brackets            ::

::                                                                                         ::

::               Usage: Enter in the command line in the following format   nd a b         ::

::                     where parameter a represents the numerator and parameter b represents the denominator                                ::

::                     You can also run directly without parameters, and the program will prompt for input                              ::

::                                                                                         ::

::               Note: The program runs in the script environment. It is slow for large denominators. Generally, do not exceed 3000          ::

::                                                                                         ::

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::



@echo off

setlocal EnableDelayedExpansion



if %2.==. goto input

set /A N=%1

set /A D=%2

set /A NN=%1

set /A DD=%2

goto compute



:input

echo Input N:

set /p NN=

set /A N=%NN%

echo Input D:

set /p DD=

set /A D=%DD%

goto compute



:compute

if %N%==0 echo Wrong Intry && goto input

if %D%==0 echo Wrong Intry && goto input

set str=



for /L %%a in (1,1,%D%) do @set /A Left%%a=0

for /L %%a in (1,1,%D%) do @set /A Result%%a=0

set /A int_part="%N%/%D%"

set /A N="%N%%%%D%"

set /A tool=%N%

if %tool%==0 echo The result of expression "%NN%/%D%" is %int_part% && goto :end

set /A turn=1



:start

set /A "tool*=10"

set /A Result%turn%="%tool%/%D%"

set /A Left="%tool%%%%D%"

if %Left%==0 set /A begin=-1 && set /A end="%turn%" && goto endCompute

if %Left%==%N% set /A begin=0 && set /A end="%turn%" && goto endCompute

if not !Left%Left%!==0 set /A begin="!Left%Left%!" && set /A end="%turn%" && goto endCompute



set /A Left%Left%=%turn%

set /A tool=%Left%

set /A "turn+=1"

goto start



:endCompute

if %3.==. echo The result of expression "%N%/%D%" is 

set result=#

for /L %%i in (1,1,%end%) do @set result=!result!!Result%%i!

set result=%result:~1%

if %begin%==-1 echo %int_part%.%result% && goto end

if %begin%==0 echo %int_part%. && goto end

echo %int_part%.!result:~0,%begin%!



:end

if %2.==. echo. && echo Press any key to quit application && pause>nul



:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

::            The return value of begin has certain meanings:                                                  ::

::                 -1: Indicates that the division has been successfully completed and can be output directly                                     ::

::                  0: Indicates that the new remainder is one and returns to the start directly                                     ::

::               Others: Indicates that it is the most general number, and there is a neck before the loop body                                     ::

::          int_part represents the integer part of the result                                                   ::

::          tool is an iterative variable, and it is working all the time                                           ::

::          turn is the index value, indicating the current position of the array                                                 ::

::          Two arrays are used in the program, playing a statistical role                                             ::

:::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::

Running result


[ Last edited by my3439955 on 2007-4-23 at 02:33 AM ]

I want to use bitwise operations can