中国DOS联盟

@echo off
set c1=5
set c2=3
set/a pen=2*c2/(c1-c2)
set/a 温差=(pen+1)*c1
set/a 温升=(温差-c1-c2)/(pen+3)
echo 原来水有%pen%杯，原来盆里的水和杯里的水的温差是%温差%度。
echo 现在温升是%温升%度。
pause

@echo off
setlocal enabledelayedexpansion

for /l %%i in (1 1 79) do (
    set /a chick_num=%%i
    set /a dog_num=79-!chick_num!
    set /a footnum=2*!chick_num!+4*!dog_num!
    if !footnum! EQU 200 (
        set msg1=小鸡的只数为：!chick_num!
        set msg2=狗的只数为：!dog_num!
        goto :exit
     )
)
:exit
    echo %msg1%
    echo %msg2%
pause>nul

@echo off
setlocal enabledelayedexpansion

for /l %%i in (0 4 100) do (
    set /a small=%%i/4
    set /a big=400-%%i*4
    set /a total=!small!+!big!
    if !total! EQU 100 (
        set msg1=小和尚人数为：%%i
        set /a num=100-%%i
        set msg2=大和尚人数为：!num!
        goto :exit
    )
)

:exit
   echo %msg1%
   echo %msg2%

pause>nul

@echo off
setlocal enabledelayedexpansion
set flag=1
call :test 243
echo 至少应该要：%flag%次

pause>nul

:test
   set /a tmp=%1 %% 2
   set /a num=%1
   if %tmp% NEQ 0 set /a num-=1
       if %num% geq 2 (
          set /a num/=2
          set /a flag+=1
          call :test !num!)
   goto :eof

@echo off
setlocal enabledelayedexpansion
echo 10000以内的素数有：
set/p a= 2 3 5 7 <nul
for /l %%a in (9 2 99) do (set/a a=%%a%%3
set/a b=%%a%%5
set/a c=%%a%%7
if not !a!==0 if not !b!==0 if not !c!==0 set/p a=%%a <nul)
for /l %%a in (101 2 9999) do (for /l %%b in (3 2 97) do (set/a a=%%a%%%%b
if !a!==0 set b=1) 
if not !b!==1 set/p a=%%a <nul
set b=0)

@echo off
:1
set/a a+=3
set/a b+=1
if not %a%==9 goto 1
echo 这只青蛙要蹦%b%次才能跳出井口
pause

@echo off
set/a a=(200-79*2)/(4-2)
set/a b=79-a
echo 共有%b%只鸡,%a%只狗
pause

@echo off
set/a a=(100*4-100*1)/(4*4-1)
set/a b=100-a
echo 共有%b%个小和尚，大和尚%a%个
pause

@echo off
setlocal enabledelayedexpansion

for /l %%a in (2 1 49) do (
   for /l %%b in (%%a 1 49) do (
      title %%a %%b
      set /a mult=%%a*%%b
      call :test !mult! %%a %%b
      set !mult!=%%a × %%b
    )
)
pause>nul

:test
    if defined %1 (
       echo !%1!=!mult!
       echo %2 × %3 =!mult!
       echo.)