计算批处理脚本中两个变量的总和 [英] Calculating the sum of two variables in a batch script

问题描述

这是我第一次使用Stack Overflow，因此请宽恕这个问题.我一直在尝试对批处理进行编程，并使用DOSbox在我的linux机器上运行它们.

这是我一直在使用的代码:

@echo off
set a=3
set b=4
set c=%a%+%b%
echo %c%
set d=%c%+1
echo %d%

其输出是:

3+4
3+4+1

我该如何添加两个变量而不是回显该字符串?

解决方案

您需要在set命令上使用属性/a.

例如

set /a "c=%a%+%b%"

这允许您在set命令中使用算术表达式，而不是简单的串联./p>

您的代码应为:

@set a=3
@set b=4
@set /a "c=%a%+%b%"
echo %c%
@set /a "d=%c%+1"
echo %d%

并输出:

7
8

This is my first time on Stack Overflow so please be lenient with this question. I have been experimenting with programming with batch and using DOSbox to run them on my linux machine.

Here is the code I have been using:

@echo off
set a=3
set b=4
set c=%a%+%b%
echo %c%
set d=%c%+1
echo %d%

The output of that is:

3+4
3+4+1

How would I add the two variables instead of echoing that string?

解决方案

You need to use the property /a on the set command.

For example,

set /a "c=%a%+%b%"

This allows you to use arithmetic expressions in the set command, rather than simple concatenation.

Your code would then be:

@set a=3
@set b=4
@set /a "c=%a%+%b%"
echo %c%
@set /a "d=%c%+1"
echo %d%

and would output:

7
8

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