Windows批处理脚本-For/L不工作--简单

需要一些快速的帮助。这是一个大学项目，除了调用我的：forLoop方法迭代100个数字（1,1100），从1开始，一直到100，然后进行迭代%5（I%%5），其他一切都正常工作。由于某种原因，我无法让它工作。感谢任何帮助或指导

当我回显%%A时，它将遍历所有的数字。当我回显%result%时，我得到一个空白“”（里面没有任何内容）

正确的代码是

:forLoop
setlocal ENABLEDELAYEDEXPANSION
FOR /L %%A IN (1,1,100) DO (
set /A result=%%A %% 5
echo !result! >> results.txt
set /A total=!total!+!result!
echo !total!
)

---

问题是当读取的

时，
%result%
被替换，这意味着在执行循环时它不再是变量。您需要的是启用延迟变量扩展，然后使用
而不是
%
：

setlocal ENABLEDELAYEDEXPANSION

:forLoop
FOR /L %%A IN (1,1,100) DO (
set /A result=%%A %% 5
echo "%%A"
echo !result!
)

运行
SET/？
时获得的帮助消息中对此进行了详细说明：

Delayed environment variable expansion is useful for getting around
the limitations of the current expansion which happens when a line
of text is read, not when it is executed.  The following example
demonstrates the problem with immediate variable expansion:

    set VAR=before
    if "%VAR%" == "before" (
        set VAR=after
        if "%VAR%" == "after" @echo If you see this, it worked
    )

would never display the message, since the %VAR% in BOTH IF statements
is substituted when the first IF statement is read, since it logically
includes the body of the IF, which is a compound statement.  So the
IF inside the compound statement is really comparing "before" with
"after" which will never be equal.  Similarly, the following example
will not work as expected:

    set LIST=
    for %i in (*) do set LIST=%LIST% %i
    echo %LIST%

in that it will NOT build up a list of files in the current directory,
but instead will just set the LIST variable to the last file found.
Again, this is because the %LIST% is expanded just once when the
FOR statement is read, and at that time the LIST variable is empty.
So the actual FOR loop we are executing is:

    for %i in (*) do set LIST= %i

which just keeps setting LIST to the last file found.

Delayed environment variable expansion allows you to use a different
character (the exclamation mark) to expand environment variables at
execution time.  If delayed variable expansion is enabled, the above
examples could be written as follows to work as intended:

    set VAR=before
    if "%VAR%" == "before" (
        set VAR=after
        if "!VAR!" == "after" @echo If you see this, it worked
    )

    set LIST=
    for %i in (*) do set LIST=!LIST! %i
    echo %LIST%
延迟的环境变量扩展有助于
线路发生故障时电流扩展的限制
读取文本的一部分，而不是在执行时。下面的例子
演示立即变量展开的问题：
设置VAR=before
如果“%VAR%”之前(
设置VAR=after
如果在“@echo”后面加上“%VAR%”，如果你看到这个，它就起作用了
)
将永远不会显示该消息，因为两个IF语句中都有%VAR%
在读取第一个IF语句时被替换，因为它在逻辑上
包括IF的主体，它是一个复合语句。所以
如果在复合语句中确实比较了“before”和
“之后”永远不会相等。类似地，下面的示例
无法按预期工作：
集合列表=
对于（*）中的%i，do set LIST=%LIST%%i
回显%LIST%
因为它不会在当前目录中建立文件列表，
而是将LIST变量设置为找到的最后一个文件。
同样，这是因为当
FOR语句被读取，此时列表变量为空。
因此，我们正在执行的实际FOR循环是：
对于（*）中的%i，执行设置列表=%i
它只是将列表设置为最后找到的文件。
延迟环境变量扩展允许您使用不同的
字符（感叹号）以在以下位置展开环境变量：
执行时间。如果启用延迟变量扩展，则上述
可以编写如下示例以按预期工作：
设置VAR=before
如果“%VAR%”之前(
设置VAR=after
如果在“@echo”后面加上“！VAR！”==”，如果你看到这个，它就起作用了
)
集合列表=
对于（*）中的%i，执行设置列表=！名单！%我
回显%LIST%
知道了。（我在查看
集合上的文档）：-）@KenWhite显然我也应该这么做！！！！谢谢；）这对我不管用。我得到
！结果
作为第二个
回波的输出
。非常感谢@盖布
Delayed environment variable expansion is useful for getting around
the limitations of the current expansion which happens when a line
of text is read, not when it is executed.  The following example
demonstrates the problem with immediate variable expansion:

    set VAR=before
    if "%VAR%" == "before" (
        set VAR=after
        if "%VAR%" == "after" @echo If you see this, it worked
    )

would never display the message, since the %VAR% in BOTH IF statements
is substituted when the first IF statement is read, since it logically
includes the body of the IF, which is a compound statement.  So the
IF inside the compound statement is really comparing "before" with
"after" which will never be equal.  Similarly, the following example
will not work as expected:

    set LIST=
    for %i in (*) do set LIST=%LIST% %i
    echo %LIST%

in that it will NOT build up a list of files in the current directory,
but instead will just set the LIST variable to the last file found.
Again, this is because the %LIST% is expanded just once when the
FOR statement is read, and at that time the LIST variable is empty.
So the actual FOR loop we are executing is:

    for %i in (*) do set LIST= %i

which just keeps setting LIST to the last file found.

Delayed environment variable expansion allows you to use a different
character (the exclamation mark) to expand environment variables at
execution time.  If delayed variable expansion is enabled, the above
examples could be written as follows to work as intended:

    set VAR=before
    if "%VAR%" == "before" (
        set VAR=after
        if "!VAR!" == "after" @echo If you see this, it worked
    )

    set LIST=
    for %i in (*) do set LIST=!LIST! %i
    echo %LIST%