批处理把十进制转换成二,八,十六进制

tmplinshi

转自: http://www.52sky.org/article/Computer%20Program/44.html

@echo off
:start210
cls
echo      十进制转换
echo.
:start20
set a=&set b=&set c=&set d=&set e=&set f=
set /p a=请输入^<十进制^>: 
set e=%a%&set f=%a%
if "%a%"=="" cls&goto start210
if %a%==dd cls&goto start210
if %a%==q exit
:30
set /a b=%a%%%2
set /a c=%a%/2
set d=%b%%d%
if %c% geq 2 set a=%c%&goto 30
if %c% equ 0 set c=
echo  对应 [二进制]: %c%%d%
set b=&set c=&set d=
:10
set /a b=%e%%%8
set /a c=%e%/8
set d=%b%%d%
if %c% geq 8 set e=%c%&goto 10
if %c% equ 0 set c=
echo  对应 [八进制]: %c%%d%
set a=&set b=&set c=&set d=
:20
set /a b=%f%%%16
if %b%==10 set b=A
if %b%==11 set b=B
if %b%==12 set b=C
if %b%==13 set b=D
if %b%==14 set b=E
if %b%==15 set b=F
set /a c=%f%/16
set d=%b%%d%
if %c% geq 16 set f=%c%&goto 20
if %c%==10 set c=A
if %c%==11 set c=B
if %c%==12 set c=C
if %c%==13 set c=D
if %c%==14 set c=E
if %c%==15 set c=F
if %c%==0 set c=
echo  对应 [16进制]: %c%%d%&echo/
goto start20COPY

jay_16

很厉害呀，能帮忙解释一下大概思路....?!谢谢

techon

十进制与2、8、16 进制转换方法
模上2取余，除以二取整，实际就是 除以二取余数，当正好除尽时（这里不包括小数），将余数由低位到高位排列 即相应十进制的二进制表，其他进制同理

▄︻┻═┳一

代码太长了，，，

Batcher

4# ▄︻┻═┳一


你给个短的呗

CrLf

5# Batcher

貌似随风写过32进制以内的通用版

plp626

不考虑速度的话，用递归，代码应该很简短

zm感兴趣否？

terse

对输入数长度判断在16位以内 如需处理更大数 可自加判断
当然 有人可处理转其他进制

@echo off&setlocal enabledelayedexpansion
set/p Str=请输入十进制数:
set "Code=0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_@"
for %%i in (2 8 16) do set S=!str!&call:lp %%i _%%i&ECHO !str! 对应 [%%i进制]: !_%%i!
pause&exit
:lp
set U=!S!FEDCBA9876543210
SET/A U=0x!U:~16,1!,R=0
for /l %%i in (0 1 %U%) do (
   set/a "N=!S:~%%i,1!+(R*10),r=N%%%1,N/=%1"
   set B=!B!!N!
   if !B! equ 0 set "B="
)
   set %2=!Code:~%R%,1!!%2!
   if defined B set S=!B!&set B=&goto lpCOPY

CrLf

7# plp626


不太明白，个人感觉常规方法就很简洁了啊

neorobin

感觉2,8,16这些特殊进制(2的正整数次方幂)可以用位运算直接些

523066680

虽然不见得好，做了就贴上来了,0123456789abcde 字符截取，这一块是抄学的。

@echo off
setlocal enabledelayedexpansion
set str=0123456789abcdef
 
call :lp 10 2
echo %num%
call :lp 10 8
echo %num%
call :lp 10 16
echo %num%
pause
 
:lp
 set "num="
 :in
 set /a x=%1/%2,y=%1 %% %2
 set num=!str:~%y%,1!%num%
 if %x% neq 0 (call :in %x% %2) else (goto :eof)COPY

CrLf

10# neorobin

老兄好久不见...
不过我感觉位此处用运算并没有优势啊

neorobin

12# zm900612
仅适用于 正数 并且要求 算术右移实现, 想到这个就写出来了, 也可把每位都存入(开头的 0 不存入)变量, if !code!==0 set "code="

@echo off & setlocal enableDelayedExpansion
REM 2147483647=~(1<<31)
set HEX_TAB=0123456789ABCDEF
for /l %%a in () do (
  set /p num="Input a decimal number: "
 
  set /a "test=1<<31
  <nul set /p="Binary: "
  for /l %%i in (31 -1 0) do (
    set /a "bit=num&test,test>>=1,test&=~(1<<31),bit>>=%%i,bit&=~(1<<31)"
    <nul set /p=!bit!
  )
  echo.
 
  <nul set /p="Hex.: "
  set /a "test=0xf<<4*(32/4-1)
  for /l %%i in (28 -4 0) do (
    set /a "bit=num&test,test>>=4,test&=(1<<28)-1,bit>>=%%i,bit&=(1<<28)-1"
    for %%p in (!bit!) do <nul set /p=!HEX_TAB:~%%p,1!
  )
  echo.
 
  <nul set /p="Octal: "
  set /a "test=07<<3*(32/3)" & rem 32=3*10+2
  for /l %%i in (30 -3 0) do ( rem Arithmetic Shift Right >>
    set /a "bit=num&test,test>>=3,test&=(1<<30)-1,bit>>=%%i,bit&=(1<<30)-1"
    <nul set /p=!bit!
  )
  echo.&echo.
)
exit /bCOPY

neorobin

还是只用于正数, 位运算实现, 只显示有效数字

@echo off & setlocal enableDelayedExpansion
REM 2147483647=~(1<<31)
set HEX_TAB=0123456789ABCDEF
for /l %%a in () do (
  set /p num="Input a decimal number: "
 
  <nul set /p="Binary: "
  set code=
  set /a "test=1<<31
  for /l %%i in (31 -1 0) do (
    set /a "bit=num&test,test>>=1,test&=~(1<<31),bit>>=%%i,bit&=~(1<<31)"
    set "code=!code!!bit!"
    if !code!==0 set code=
  )
  echo !code!
 
  <nul set /p="Hex.: "
  set code=
  set /a "test=0xf<<4*(32/4-1)
  for /l %%i in (28 -4 0) do (
    set /a "bit=num&test,test>>=4,test&=(1<<28)-1,bit>>=%%i,bit&=(1<<28)-1"
    for %%p in (!bit!) do set "code=!code!!HEX_TAB:~%%p,1!"
    if !code!==0 set code=
  )
  echo !code!
 
  <nul set /p="Octal: "
  set code=
  set /a "test=07<<3*(32/3)" & rem 32=3*10+2
  for /l %%i in (30 -3 0) do ( rem Arithmetic Shift Right >>
    set /a "bit=num&test,test>>=3,test&=(1<<30)-1,bit>>=%%i,bit&=(1<<30)-1"
    set "code=!code!!bit!"
    if !code!==0 set code=
  )
  echo !code! & echo.
)
exit /bCOPY

terse

输入数在可运算范围内的位移
如超出运算范围 8楼代码可处理大数

@echo off&setlocal enabledelayedexpansion
set/p T=输入10进制数:
set "Code=0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_@"
for %%i in (1 3 4) do (
    set /a "i=1<<%%i,j=i-1"
    set S=%T%
    for /l %%j in (0 1 31) do (
        if !S! neq 0 (
           set/a "B=S&j,S>>=%%i"
           for %%k in (!B!) do set _%%i=!Code:~%%k,1!!_%%i!
        )
    )
    echo %T% 对应 !i! 进制 "!_%%i!"
)
pauseCOPY