Validating user input in c

Visit Stack Exchange This is a tiny learning program that lead to an interesting question: how can I best/most elegantly handle user entered numbers? It doesn't apply to types other than build in ones (as far as I know), but for floats and integers it's a nice feature. Exceptions are supposed to be used for exceptional situations.Validating user input is part of the normal functionality of the program, not an exceptional situation.Let us now proceed with a simple example to understand the concepts better − Here, it should be noted that scanf() expects input in the same format as you provided %s and %d, which means you have to provide valid inputs like "string integer".If you provide "string string" or "integer integer", then it will be assumed as wrong input.

An input can be given in the form of a file or from the command line.

C programming provides a set of built-in functions to output the data on the computer screen as well as to save it in text or binary files. So devices such as the display are addressed in the same way as files and the following three files are automatically opened when a program executes to provide access to the keyboard and screen.

The file pointers are the means to access the file for reading and writing purpose.

Secondly, while reading a string, scanf() stops reading as soon as it encounters a space, so "this is test" are three strings for scanf().

One problem I have is I cannot find any support material to help validate the user input, for instance if the user pressed the letter a, this would simply kill the program. It's also very similar to validating user input in an ASP.

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