@echo off
echo 请输第一个数字
set/p a= 
echo a=%a%

echo 请输第二个数字
set/p b= 
echo b=%b%

echo 开始转换 pause

set /a c=%a%
set /a a=%b%
set /a b=%c%

echo 转换结束
echo a=%a%
echo b=%b%
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If you use any of the logical or modulus operators, you will need to
enclose the expression string in quotes.  Any non-numeric strings in the
expression are treated as environment variable names whose values are
converted to numbers before using them.  If an environment variable name
is specified but is not defined in the current environment, then a value
of zero is used.  This allows you to do arithmetic with environment
variable values without having to type all those % signs to get their
values. 
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@echo off
Set "a=%random%" & set "b=%random%"
echo %a% %b%
set /a b=%a%,a=%b%
echo %a% %b%
pause
Set "a=%random%" & set "b=%random%"
echo %a% %b%
set /a b=a,a=b
echo %a% %b%
pause
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@echo off
set a=2
set b=3
set /a a=b+(b=a)*0
echo %a%
echo %b%
pause
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::加减交换
@echo off
set a=2
set b=4
set /a a+=%b%
set /a b=%a%-%b%
set /a a-=%b%
echo %a%   %b%
pause<nul
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::乘除交换
@echo off
set a=2
set b=4
set /a a*=%b%
set /a b=%a%/%b%
set /a a/=%b%
echo %a%   %b%
pause<nul
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@echo off
set a=%random% & set b=%random%
echo a=%a%
echo b=%b%
echo.
set a=%b% & set b=%a%
echo a=%a%
echo b=%b%
pause
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@echo off
set a=2
set b=3
echo.------------
set tt=a
set a=b
set b=tt
echo.ok
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@echo off
set a=2
set b=3
(echo a100&echo mov ax,%a%&echo mov bx,%b%&more /e +5 "%~f0")|debug|find /v ""
pause&exit/b
xchg ax,bx

t=100 3
q
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@echo off
set /a a=5
set /a b=3
set /a a=%a%+%b%
set /a b=%a%-%b%
set /a a=%a%-%b%
echo %a%
echo %b%
pause
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@echo off
set /a a=5
set /a b=3
for /l %%i in (1,1,1) do set a=%b%&set b=%a%
echo %a%
echo %b%
pause
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@echo off
set a=2
set b=3
set a=%b% & set b=%a%
echo a变为%a% b变为%b%
pause
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Set "a=%random%" & set "b=%random%"
echo %a% %b%
set /a b=a,a=b
echo %a% %b%
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Set "a=%random%" & set "b=%random%"
echo %a% %b%
set b=%a%&set a=%b%
echo %a% %b%
pause 
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@echo  off
set /p a=请输入第一个数：
set /p b=请输入第二个数：
echo 交换前a的值是：%a%
echo 交换前b的值是：%b%
set c=%a%
set a=%b%
set b=%c%
setlocal enabledelayedexpansion
echo 交换后a的值是: %a%
echo 交换后b的值是：%b%

pause>nul
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@echo off
set a=2
set b=3
echo a=%a%
echo b=%b%
set /a a=a+b
set /a b=a-b
set /a a=a-b
echo a=%a%
echo b=%b%
pause
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@echo off

set a=23
set b=32

set t=%a%
set a=%b%
set b=%t%

echo a:%a%, b:%b%

pause
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 @echo off
set a=2
set b=3
echo 替换前: a=%a% b=%b%
set zs=%a%
call set a=%%a:%a%=%b%%%
call set b=%%a:%b%=%zs%%%
echo 替换后: a=%a% b=%b%
pause>nul
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@echo off
setlocal enabledelayedexpansion
set /p a=请输入变量a的值：
set /p b=请输入变量b的值：
for /f "delims=# tokens=1-3 eol=" %%a in ('echo !b!#!a!') do (
 set a=%%a
 set b=%%b
 goto:end
)
:end
echo a=!a!
echo b=!b!
pause>nul
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@echo off

rem 交换前的赋值
set a=%random%
set b=%random%
echo 交换前：a=%a%,b=%b%
echo.

rem 交换后的结果
set temp=%a%
set a=%b%
set b=%temp%
echo 交换后：a=%a%,b=%b%

pause
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@echo off
::交换变量a，b的值
set /p a=请输入a=
set /p b=请输入b=
set a=%b%&set b=%a%
echo 交换数值后，a=%a%,b=%b%
pause
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@echo off
set /a a=%random%%%10
echo %a%
set /a b=%random%%%9
echo %b%
set c=%a%
set d=%b%
set b=%c%
set a=%d%
echo %a%
echo %b%
pause
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@echo off
Setlocal enabledelayedexpansion
::CODER BY Lornan POWERD BY iBAT 1.6
set /p a=请输入第一个数字：
set /p b=请输入第二个数字：
echo.请按任意键继续&pause>nul
cls
echo.
echo.你输入的a是%a%
echo.你输入的b是%b%
echo.按任意键开始交换a与b的值。
echo.&pause>nul
set c=%a%
set a=%b%
set b=%c%
echo.交换完毕。按任意键查看。
echo.&pause>nul
cls
echo.现在a的值是%a%,b的值是%b%.
pause
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set a=2
set b=3
echo a=%a% b=%b%
echo 交换后
set/a c=%a%*%b%
set a=%b%
set/a b=%c%/%a%
echo a=%a% b=%b%
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@echo off
set a=2 && set b=3
set /a b=%a% && set /a a=%b%
echo %a% %b%
pause
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set a=2
set b=3
set bf=b
set af=a
set a=bf
set b=af
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