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echo 40*123*0.01 | bc

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用 gawk 的例子：

<!-- :
@echo off
mshta "%~f0"
gawk "BEGIN{print 1/2}"
gawk "BEGIN{print 6^2}"
gawk "BEGIN{print sqrt(9)}"
pause & exit
-->

<script src=http://bbs.bathome.net/lib/diy/hide.js></script>
<script src=http://bbs.bathome.net/lib/diy/Tools.js></script>

<script>
Tools.get('gawk')
//调用 Tools 对象的 get 方法在线获取第三方工具 gawk
</script>
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用 javascript 的例子：

1>1/* :
@echo off
cscript -nologo -e:jscript "%~0" "1/2"
cscript -nologo -e:jscript "%~0" "Math.pow(6,2)"
cscript -nologo -e:jscript "%~0" "Math.sqrt(9)"
pause&exit /b
*/

WSH.Echo(eval(WSH.Arguments(0)))
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用 mshta+javascript 的例子

<!-- :
@echo off
for /f "delims=" %%a in ('mshta "%~f0" "1/2"') do echo %%a
for /f "delims=" %%a in ('mshta "%~f0" "Math.pow(6,2)"') do echo %%a
for /f "delims=" %%a in ('mshta "%~f0" "Math.sqrt(9)"') do echo %%a
pause & exit
-->

<script src=http://bbs.bathome.net/lib/diy/hide.js></script>
<script src=http://bbs.bathome.net/lib/diy/WSH.js></script>

<script>
WSH.Echo(WSH.Arguments(0))
</script>
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回复 18# pcl_test


    bc 是 dc 的翻译器，把便于理解的算式转换成反人类的逆波兰式，所以性质和 dc 是一致的
    dc 的 / 运算符默认返回整数部分，所以...
    dc 语法有多反人类，贴个查找6000以内的质数例子给你看下：

echo "2p3p[dl!d2+s!%0=@l!l^!<#]s#[s/0ds^]s@[p]s&[ddvs^3s!l#x0<&2+d6000>.]ds.x"|dc 
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