Validating c

strtod would convert all of 49.99 were as when using strtol you would change to call it once to convert the 49, then skip the .and then call it again to convert the 99 then combine the 2 values into a total cents.The validated event works the same, only pass it the name textbox instead.Here is just the validating event handler’s code: The event driven validation model in Win Forms is powerful and flexible enough to allow you to create high quality apps that implement robust and maintainable validation code in your forms.If you really want to using floating point types then for your program I would use fgets to read in the string and then strtod to convert it to a double.

When the value is read in, I need to return a message to the user if the value is incorrect and prompt them to re-enter until they get it right.There are 2 code paths for validation failure, and in each case we provide the user with an appropriate error message.The error provider simply takes a control and a message in the Set Error method and does the rest of the work for you!Let’s assume when we click our save button that we wish to validate the controls and display an icon if there is a problem.

First, add the following code to the Form’s constructor after the Initialize Component method: This is a handy trick to prevent implicit validation of our controls when they lose focus.

This is because a floating point type holds an approximation to a value the chances of it holding 46 even if you entered 46.00 are small.