October 2004
Beginner
408 pages
9h 24m
English
Content preview from C Programming: Visual Quickstart GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Validating Keyboard Input
The biggest problem when working with standard input is that it's reliant on the user properly responding. If the user does not type the right number or format of input, the application cannot be expected to perform properly. This is the old garbage in, garbage out maxim and the reason you'll want to validate input before working with it.
The validity of many answers can be checked with relative ease. For example:
Seeing if an age variable is greater than 0 but less than, say, 120
Checking that an answer is equal to Yes or No (or Y, y, N, n)
Comparing an input against the logical values (like C and F in the temperature-conversion application)
In other cases—such as a temperature conversion where the inputted number can ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.