@echo off 
setlocal enableextensions enabledelayedexpansion 
title 批处理算24点
echo 批处理算24点&echo. 
:loop 
set /p "n=输入四个数用空格分开: " 
set /a "lzn=0" 
for %%i in (!n!) do set /a "lzn+=1"&set /a "lz!lzn!z=%%i,lz!lzn!m=1,lz!lzn!s=%%i" 
call:liuzhaonan11 lz 
if not errorlevel 1 echo 结果: 没有答案 
goto loop 
原理说明:使用有理数进行计算,选择算式中最先结合的两数和它们之间的运算,并递归. 
:liuzhaonan11 
setlocal 
set "f1=+"&set "f2=-"&set "f3=*"&set "f4=/" 
for /l %%i in (1,1,!%1n!) do for /l %%j in (1,1,!%1n!) do if %%i neq %%j ( 
for /l %%k in (1,1,4) do ( 
setlocal 
if %%k leq 2 set /a "z=%1%%jz*%1%%im!f%%k!%1%%jm*%1%%iz,m=%1%%jm*%1%%im" 
if %%k equ 3 set /a "z=%1%%jz*%1%%iz,m=%1%%jm*%1%%im" 
if %%k equ 4 set /a "z=%1%%jz*%1%%im,m=%1%%jm*%1%%iz" 
if !%1n! equ 2 ( 
set /a "t=!z!-24*!m!" 
if !t! equ 0 if !m! neq 0 echo 结果: !%1%%js! !f%%k! !%1%%is! = 24&exit /b 1 
) else ( 
set "s=(!%1%%js! !f%%k! !%1%%is!)"&set /a "n=0" 
for /l %%l in (1,1,!%1n!) do if %%l neq %%i if %%l neq %%j ( 
set /a "n+=1"&set "%1!n!z=!%1%%lz!"&set "%1!n!m=!%1%%lm!"&set "%1!n!s=!%1%%ls!" 
) 
set /a "n+=1"&set "%1!n!z=!z!"&set "%1!n!m=!m!"&set "%1!n!s=!s!" 
set "%1n=!n!"&call%0 %1 
if errorlevel 1 exit /b 1 
) 
endlocal 
) 
) 
exit /b 0
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