Validating numeric values in c

Validating numeric values in c

The various functions of these methods are : cin.fail() - This function returns true when an input failure occurs.In this case it would be an input that is not an integer.All basic PHP functions which i tried returned unexpected results.I would just like to check whether some variable only contains numbers.In C programming, a character variable holds ASCII value (an integer number between 0 and 127) rather than that character itself.

Bottom line: toolic's advice is probably about as good as any you'll find.If the cin fails then the input buffer is kept in an error state.cin.clear() - This is used to clear the error state of the buffer so that further processing of input can take place.The regular expression allows for the decimal digits 0 through 9, for the comma and dot which may be present is oft-encountered numbers, and an E to allow for scientific notation.But one could add and add and not cover all the possibilities withoiut making the regex unable to distinguish between numbers and words like "FIE".

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In the program,'a' is used instead of 97 and 'z' is used instead of 122.

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