集/对空回答崩溃 [英] set /p empty answer crash

问题描述

我是新来的，所以我会尽力，因为我可以为好。

i am new here so i'll try to be as good as i can.

所以，我试图做一个RPG基于基于文本的MS-DOS，然后我要去pretty以及我刚才看到，如果用户把一个无效的输入在设定/ P，像一个空的答案（只需pressing进入）或答案是不是如果，批量刚刚崩溃了，我想解决这个问题，因此会少crashy。

So i am trying to make a RPG based on text-based MS-DOS, and i am going pretty well as i just saw that if the user puts an invalid input at set /p, like an empty answer (just pressing enter) or an answer which is not on the "IF", the batch just crashes, and I would like to fix that so it will be less crashy.

下面是其中的一个部分，我想解决：

Here is one of the parts i'd like to fix:

@echo off
title "Wasteland Adventure"
color 0A
cls
:Menu
cls
echo.
echo.
echo Welcome to Wasteland Adventure
echo.
echo To start a new game, type NEW and press ENTER.
echo To see instructions for the game, type INSTRUCTIONS and press ENTER.
echo To quit, type QUIT and press ENTER.
set input=
set /p input=What do you want to do? 
if %input%==new goto INTRO
if %input%==instructions goto INSTRUCTIONS
if %input%==quit goto EXIT

在此先感谢

推荐答案

这不是设置/ P 的崩溃，但是：

if %input%==new 

如果％的输入％是空的，这被分析为：

if %input% is empty, this is parsed as:

if ==new 

显然是一个语法错误。为了避免这种情况，使用：

obviously a syntax error. To avoid this, use:

if "%input%"=="new"

然后空输入将被解析为：

An empty input will then be parsed as:

if ""=="new"

这工作正常。完成code是这样的：

which works fine. Complete code like this:

:Menu
set input=
set /p input=What do you want to do? 
if "%input%"=="new" goto INTRO
if "%input%"=="instructions" goto INSTRUCTIONS
if "%input%"=="quit" goto EXIT
REM for any other (invalid) input:
goto :Menu

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