批处理-更高级的计算 [英] Batch- do more advanced calculations

问题描述

批量使用set /a进行更高级的计算时遇到麻烦.小数将不起作用；例如，set /a 5/2仅输出2而不是2.5.同样，批处理也无法处理大量计算.有没有办法只制作一个临时文件(如vbs)或调用另一个程序(如计算器)进行计算并将其返回到批处理文件中?

In batch, I have trouble doing more advanced calculations with set /a. Decimals won't work; for example set /a 5/2 only outputs 2 instead of 2.5. Also batch can't handle large calculations. Is there a way to just make a temp file (like vbs) or call on another program (like calculator) to do the calculation and return it back to the batch file?

推荐答案

下面的程序作为Batch-JScript混合脚本的示例，允许评估任何JScript表达式:

The program below as an example of a Batch-JScript hybrid script that allows to evaluate any JScript expression:

@if (@CodeSection == @Batch) @then

@echo off

rem Define an auxiliary variable to call JScript
set JScall=Cscript //nologo //E:JScript "%~F0"

for /F %%p in ('%JScall% Math.PI') do echo Intrinsic value of PI= %%p
for /F %%P in ('%JScall% 4*Math.atan(1^)') do echo Calculated value of PI= %%P
for /F %%S in ('%JScall% Math.sqrt(2^)') do echo Square Root of 2 = %%S
for /F %%t in ('%JScall% 1/3') do set oneThird=%%t
echo One third = %oneThird%
for /F %%o in ('%JScall% %oneThird%*3') do echo One third times 3 = %%o

goto :EOF

@end

// JScript section

WScript.Echo(eval(WScript.Arguments.Unnamed.Item(0)));

输出:

Intrinsic value of PI = 3.14159265358979
Calculated value of PI= 3.14159265358979
Square Root of 2 = 1.4142135623731
One third = 0.333333333333333
One third times 3 = 0.999999999999999

您可以在以下位置查看可用的JScript算术函数: http://msdn.microsoft.com/zh-CN/library/b272f386(v = vs.84).aspx

You may review the available JScript arithmetic functions at: http://msdn.microsoft.com/en-us/library/b272f386(v=vs.84).aspx

此方法允许将JScript代码保留在相同的.BAT文件中，并且比VBScript代码更简单，更快.

This method allows to keep the JScript code in the same .BAT file and is simpler and faster than the VBScript code.

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