Question

嗨我现在制作一个简单的批处理文件，我试图在最后添加正确的答案编号，但它一直说零，因为选择答案时变量值不会改变。这是我的代码

@echo off
title Game One
color 1f
::#############################
:one
set correctn=0
set correctn2=0
cls
echo What is 2 + 2?
echo.
echo.
echo A) 6
echo B) 4
echo C) 49
echo D) 17
echo.
echo.
echo Type the correct answer.
set /p ch1=
echo.
echo.
if not defined ch1 (goto one)
if %ch1%==A goto no
if %ch1%==A correctn=0
if %ch1%==B goto yes
if %ch1%==B correctn=1
if %ch1%==C goto no
if %ch1%==C correctn=0
if %ch1%==D goto no
if %ch1%==D correctn=0
pause>null
::#########################################
:no
cls
echo Sorry, that answer is incorrect.
echo.
echo.
echo The correct choice was B, which was 4.
pause>null
goto two
::#########################################
:yes
cls
echo You are correct. Congratulations.
echo Press any key to continue.
pause>null
goto two
::##########################################
:two
cls
echo What is 100 divided by 2?
echo A) 45
echo B) 50
echo C) 90
echo D) 17
echo.
echo.
set/p ch2=
echo.
echo.
if not defined ch2 (goto two)
if %ch2%==A goto no2
if %ch2%==A correctn2=0
if %ch2%==B goto yes2
if %ch2%==B correctn2=1
if %ch2%==C goto no2
if %ch2%==C correctn2=0
if %ch2%==D goto no2
if %ch2%==D correctn2=0
echo Invalid Choice, Please Try Again!
pause>null
::#################################
:no2
cls
echo Sorry, that answer is incorrect.
echo.
echo.
echo The correct choice was B, which was 50.
pause>null
::########################################
:yes2
cls
echo You are correct. Congratulations.
echo Press any key to continue.
pause>null
goto end
::######################################
:end
set/a correct=%correctn% + %correctn2%
echo Number of answers correct was %correct%
pause>null

那么如果已经存在变量，如何在if语句中更改变量值？

Answer 1

首先需要set变量，然后goto。按照目前的编写，您的脚本首先转到标签yes。因此，永远不会达到if %ch1%==B set correctn=1行：

if %ch1%==B goto yes
if %ch1%==B set correctn=1
if %ch1%==B goto yes

此外，IF command字符串比较区分大小写，没有/I开关;尝试以下方法：

if /I %ch1%==B (set correctn=1&goto yes)

我建议使用（Windows原生）CHOICE.EXE而不是set /p用于单个按键用户输入，例如：

CHOICE /C abcd
IF %errorlevel%==2 (
    set correctn=1
    goto yes
) else (
    set correctn=0
    goto no
)

如何在If中设置变量值

1 个答案: