Validating c input

31-Jan-2018 14:05 by 3 Comments

Validating c input

If you enter a letter rather than a number, the scan will stop without consuming any of the characters, the next input call will return due to the already buffered line, and may still consume nothing.Your program loops continuously because every input statement is failing to consume the newline and returns immediately.

These extra hidden characters are what is messing with your input and spawning the infinite while loop.This post discusses some of the techniques and its shortcomings and what could be done to improve the quality of validation.Now, consider a program has to accept only integer inputs and reject all the others.You can use casting to check to see if an input number is an integer by comparing the input to the (int) cast of the number.Something like this should work: will be the space, if I have something like this: It will tell C to print my Double, but to treat it like an integer.

Only the 5 will be printed and you won't get any type mismatch errors.

But scanf() is dangerous for scanning in char strings, since its input length is not limited and you have to provide it a pointer to a finite-length input buffer.

Better to use fgets(), which allows you to limit the input buffer length.

Though this technique seems to work fine it hides a dangerous fault that can occur.

This can be considered as a dis advantage of using c .

Luckily, I was able to parse through the extra characters one-by-one and get something working.

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