She seems to write code just fine. You are the one who had a basic principle being taught to them and instead of doing some critical thinking you opted to just re-ask the question and avoid the person answering your question with both an answer and a methodology.

tolower(x) will return a lower case version of x.

Thus:

switch(x) is still going to check x.

In other words, x is not lowercase-ified...unless it was lowercase to begin with

switch(tolower(x)) will check a lowercase version of x.

You should be able to comprehend now.

**paulogrady** · 10-03-2008

Originally Posted by paulogrady

Hi

I want to create a menu but only with 2 choices: a, b.
Use tolower function on the input and use it for making an assignment statement.
If the user enters an incorrect character then the screen will clear and they will be prompted with the same question again.

How do I do this?

Point taken with the tolower function.

But I really want the best method for catching a user input error. Can you offer some advice or an example piece of code?

**Elysia** · 10-03-2008

This may probably be somewhat overcourse, but how I'd generally like to do it is:

Code:

std::string input;
std::getline(input, cin);
int x;
try
{
    x = boost::lexical_cast<int>(input);
}
catch(boost::bad_lexical_cast&)
{
    // Invalid input code here
}
// Input OK

Of course, it requires boost.

**paulogrady** · 10-03-2008

ne 1 else?

**prog-bman** · 10-03-2008

Do something similar to what Elysia said but using the standard C++ libs

Using std::string and std::getline
http://www.cplusplus.com/reference/string/string/
http://www.cplusplus.com/reference/string/getline.html

Using isdigit
http://www.cplusplus.com/reference/c...e/isdigit.html

**Elysia** · 10-04-2008

Boost is generally portable, however, so it's not that much of a bad deal.

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