rat

::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

如果a和b中至少有一个为0，怎么办？

rat

@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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