simple if question

I have a program which asks the user for a number (float) but if the user inputs a char instead of a float it sends my program into a loop which never ends.  I want to know if there is a way to read what the user inputs and if it is a char then it will tell the user they must enter a number and repeats the orginal question.

basic example

 
float x;
cout << "enter number";
cin >> x;

if (x != char) // problem is here

cout << "Number is: " << x;
else
cout << "you must enter a number";
LVL 1
onestarAsked:
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

nietodCommented:
The way around this is the let the user enter a character string.  Then try to convert the string to a number (integer or real, as needed).  

As I'm not very familia with C I/O, I won't submit code examples, unless no one else can help (unlikely).
0
nietodCommented:
By the way the character string can be converted to an integer with atoi() or to a floating point with atof().
0
nietodCommented:
What the heck.  I found what I needed.

char InputLine[100];

cin.getline(InputLine,100);
// You can test input line for invald characters here.  (Let me know if you need help on this.)  
float x = atof(InputLine);
0

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Cloud Class® Course: Microsoft Azure 2017

Azure has a changed a lot since it was originally introduce by adding new services and features. Do you know everything you need to about Azure? This course will teach you about the Azure App Service, monitoring and application insights, DevOps, and Team Services.

nietodCommented:
Not that you can test the strign entered by the use for invalid characters, but you don't have to.  the conversion fucntions start at the beginning of the string and stop converting when they reach an invalid character.  So if the user enters "123abc" it will convert to 123.  If the user enters "abc" it will convert to 0.  This may or may not be acceptable to you as is.
0
kellyjjCommented:
dang nietod,  you beat to the punch.  I was trying to answer the question when you did.  Damn it all to hell!!!  hehehe
0
kellyjjCommented:
Do you mean to have an "if" in there?  like "if (x)"?
0
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
C++

From novice to tech pro — start learning today.