China DOS Union

C:\>set/a a=999999999999999999999/8
Invalid number. Numeric precision limited to 32 bits.

I'm wondering, adding 41 zeros to the tail of the dividend means even more digits, right? It can still calculate? Why?

Adding 41 zeros to the tail of the dividend is for outputting decimals. My script can handle dividends with thousands of digits. If you don't believe it, try it yourself

I looked over moderator qwe1234567's code on the 102nd floor. It's written very well. It absorbed the best ideas from earlier posts, and changed brother he200377's repeated-calculation plan of adding zeros at the end to improve precision into dividing the divisor down to 9 digits and then taking it out one digit at a time for calculation. Because of that, it broke through the digit limit on the dividend. It also considers some details more thoroughly, such as carrying around the decimal point, etc. This is the crystallization of collective wisdom.

To break through the digit limit of the divisor, a more divergent line of thinking is needed. And I still haven't had the courage to implement that algorithm I fear so much. Maybe I really am a bit scared, scared that its efficiency will give you all a shock...

[ Last edited by pengfei on 2006-10-21 at 00:45 ]

To break through the digit limit of the divisor, you first need to come up with an approach

As for breaking through the divisor digit limit, I don't think there's any good method. I really can't think of one anymore

I actually can break through the divisor digit limit, the method is still being worked out

Originally posted by qwe1234567 at 2006-10-21 23:01:
I actually can break through the divisor digit limit, the method is still being worked out

Talk about the basic idea~ everyone can think about the method together, haha~

Using a simulated array method?
Say it already~~~ :）））

Just divide first, then multiply, then subtract

Originally posted by qwe1234567 at 2006-10-21 23:20:
Just divide first, then multiply, then subtract

Still don't understand~

Wait until I post it, then you'll understand

OK, I'll look at your work. My algorithm does break through the digit limit, but the efficiency is too low.

After several days of continuous testing and code optimization, I finally made a script that can perform division on N-digit real numbers. But the divisor had better stay within 16 digits, otherwise the waiting time gets too long; the more digits the divisor has, the longer the wait! Please test it....
Sigh, CMD's calculation speed is too slow....
@echo off cls title China DOS Union Forum made by qwe1234567 color 17 setlocal enabledelayedexpansion if not %1*==* (set num1=%1&if not %2*==* (set num2=%2&goto jmp) ELSE goto 错误) :输入 set num1= set num2= echo Real Number Division Script echo. echo In theory, this script can perform division on real numbers within N digits echo. echo Note: Other than Arabic numerals, the first character may be the "-" sign, and at most one "." is allowed, echo no other characters are allowed. Otherwise, it will all be treated as invalid input... echo. echo China DOS Union Forum made by qwe1234567 set/p num1=Please enter the dividend: set/p num2=Please enter the divisor: :jmp set fh1= set fh2= set fh= if %num1%*==* goto 错误 if %num2%*==* goto 错误 if %num1:~0,1%==- set fh1=-&set num1=%num1:~1% if %num2:~0,1%==- set fh2=-&set num2=%num2:~1% if %fh1%*==-* (if %fh2%*==* set fh=-) else if %fh2%*==-* set fh=- set err=0 echo %num1%|find ".">nul&&set num1=0%num1%0 call :去错 %num1% num1 echo %num2%|find ".">nul&&set num2=0%num2%0 call :去错 %num2% num2 if %err%==1 goto 错误 for /f "tokens=1* delims=." %%a in ("%num1%") do (set o1=%%a set t1=%%b) for /f "tokens=1* delims=." %%a in ("%num2%") do (set o2=%%a set t2=%%b) call :去首0 %o1% set o1=%sw% call :去首0 %o2% set o2=%sw% call :去尾0 %t1% set t1=%sw% call :去尾0 %t2% set t2=%sw% if not %t1%==0 (set o3=%o1%.%t1%) else set o3=%o1% if not %t2%==0 (set o4=%o2%.%t2%) else set o4=%o2% if %o4%==0 goto 错误 if %o3%==0 echo The result is 0÷%fh2%%o4%=0&goto 输入 call :计数 %t1% set s1=%sw% call :计数 %t2% set s2=%sw% If %s1% geq %s2% (set/a s3=s1-s2 call :加尾0 !s3! %t2% set t2=!sw! ) ELSE (set/a s3=s2-s1 call :加尾0 !s3! %t1% set t1=!sw!) set tmp1=%o1%%t1% set tmp2=%o2%%t2% call :去首0 %tmp2% set tmp2=%sw% call :计数 %sw% set s2=%sw% call :去首0 %tmp1% set tmp1=%sw% call :计数 %sw% set s1=%sw% set/a zsw=s1-s2 call :去尾0 %tmp2% set tmp2=%sw% call :计数 %sw% set s2=%sw% if %sw% gtr 8 set/a s2=8-sw set tmp1=%tmp1%0000000000000000000000000000000000000000 set tmp=!tmp1:~0,%sw%! set sw1=!tmp1:~%sw%! set jg= set tmp1=%tmp2:~0,8% set sw0=!tmp:~0,%s2%! if %sw% LEQ 8 set/a s2+=1 :开始计算 set/a jg0=sw0/tmp1 :计算 if %jg0%==0 goto 结果 set a1=%tmp2:~-8% set a2=%tmp2:~0,-8% set a3=* set a4=0 set ji= :乘 if %a1:~0,1%==0 set a1=1%a1%&set a3=1 set/a ji0=jg0*a1+a4 if %a3%==1 set ji=%ji:~-8% set a4=%ji0:~0,-8% set ji=%ji0:~-8%%ji% if %a4%.==. set a4=0 if %a2%.==. goto 减 set a1=%a2:~-8% set a2=%a2:~0,-8% goto 乘 :减 if not %a4%==0 set ji=%a4%%ji% set a1=%tmp% set jg1=0 set jg2= :减法 set a2=%a1:~-9% set a1=%a1:~0,-9% if not %a1%.==. set a2=1%a2% set a3=%ji:~-9% call :去首0 %a3% set a3=%sw% set ji=%ji:~0,-9% set/a jg5=a2-a3+jg1 set/a jg1=0%jg5:~0,-9%-1 if %a1%.==. (if %jg5:~0,1%==- (set jg1==-1) else set jg1=0) :1 if not %a1%.==. if %jg5:~0,-8%.==. set jg5=0!jg5!&goto 1 set jg2=%jg5:~-9%%jg2% if %a1%*==* (if %jg1%==-1 (set/a jg0-=1&goto 计算) ELSE set tmp=%jg2%&goto 结果) goto 减法 :结果 if %sw1%.==. set jg=%jg%%jg0%&goto 显示 set tmp=%tmp%%sw1:~0,1% call :去首0 %tmp% set tmp=%sw% set sw1=%sw1:~1% set jg=%jg%%jg0% set sw0=!tmp:~0,%s2%! goto 开始计算 :显示 if not %jg:~0,1%==0 (set/a zsw+=1) if %jg:~0,1%==0 set jg=%jg:~1% if %zsw% gtr 0 goto jxs for /l %%c in (0,-1,!zsw!) do set jg=0!jg! set o1=%jg:~0,1% set o2=%jg:~1% goto xs :jxs set o1=!jg:~0,%zsw%! set o2=!jg:~%zsw%! :xs call :去尾0 %o2% set o2=%sw% if %o2%==0 (set jg=%o1%) else set jg=%o1%.%o2% echo The result is: echo %fh1%%o3%/%fh2%%o4%=%fh%%jg% pause goto :eof :去首0 set sw=%1 :qs1 if %sw%==0 goto :eof if %sw:~0,1%==0 set sw=!sw:~1!&goto qs1 goto :eof :去尾0 set sw=%1 :qw1 if %sw%==0 goto :eof if %sw:~-1%==0 set sw=!sw:~0,-1!&goto qw1 goto :eof :计数 set sw=0 set sw1=%1 if %sw1%==0 set sw=1&goto :eof :js1 if not %sw1%*==* set sw1=%sw1:~1%&set/a sw+=1&goto js1 goto :eof :去错 echo %1|find ".">nul||set %2=%1.0 for /f "tokens=1* delims=." %%i in ("%1") do echo %%i%%j|findstr "^*$">nul||set err=1 goto :eof :加尾0 set sw=%2 if %1==0 goto :eof for /l %%c in (1,1,%1) do set sw=!sw!0 goto :eof :错误 echo You entered illegal characters, or the divisor is 0! echo Please re-enter... goto 输入

This script is 4K long.

Moderator qwe1234567, this one is much better written, haha, and it even has explanations, so it's not tiring to read~ bump