Checking if input is correct data type in C#

Question

What I would like is to basically have the user enter in a float, and then the system check that the input is indeed a float, and if it is then it will proceed with the code, and if it is not then the user will have to re-input the with the correct data type. Sorry for the beginners question, an example of the code is:

            Console.Write("Response Value > ");
            Response = float.Parse(Console.ReadLine())

            Ask_Count = Ask_Count + 1;
            if (Response > 0 && Response < 6)
            {
                Valid_Count = Valid_Count + 1;
            }

How would I go about the program checking to see if Response is a float?

Thank you.

Nikhil Agrawal · Accepted Answer · 2012-08-16 09:20:15Z

8

Use float.TryParse for it.

Console.Write("Response Value > ");
if(float.TryParse(Console.ReadLine(), out Response)
{
    Ask_Count = Ask_Count + 1;
    if (Response > 0 && Response < 6)
        Valid_Count = Valid_Count + 1;
}
else
    Console.WriteLine("Number entered is not a float");

answered Aug 16, 2012 at 9:20

Nikhil Agrawal

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2 Comments

Alexander R Over a year ago

While correct, perhaps it would be more useful if you included a link to MSDN and/or showed how this would integrate with the current code? Just giving a method name isn't really an answer.

Nikhil Agrawal Over a year ago

@AlexanderR: I was writing it. check out.

John Woo · Accepted Answer · 2012-08-16 09:22:23Z

2

another is by using is float.

bool result = varName is float;

or

float x = 0;
bool result = float.tryParse(varname, out x);

answered Aug 16, 2012 at 9:22

John Woo

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1 Comment

Alexander R Over a year ago

Not for this particular scenario. Console.ReadLine() will always return a string.

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