Avoid This Common Scanf Mistake! [C Tutorial]

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So there's this common ‘scanf’ or ‘getchar’ mistake that a lot of beginners make when first starting to learn how to code in C. These two C functions are common functions that beginners learn to handle basic user input for their programs. These mistakes are pretty understandable. Even I myself have made this mistake in the past, and I think it's even possible for senior developers to make this mistake too.
I got some emails recently from a new C programmer, named Syed, asking me questions about the issues with his use of ‘scanf’ and ‘getchar’. He encountered this issue while he was going through my 30 Day Beginner Coding Challenge (Click the link above to download it for free!).
The first program in that guide is a tip calculator program and he was having issues with the second time the program would run. This is a common mistake that I see people make when first starting to use ‘scanf’ and ‘getchar’ so I thought it would be helpful if I did a video about it going into it with a little more depth.
In this video, you'll learn:
✅ how to debug code effectively
✅ another use case for why I like C
✅ how to use scanf with characters properly
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[@henrikmdev]

Want some guidance to help you learn how to code?
📘Download my FREE 30 day coding challenge here:
henrikmdev.com/challenge

[@kabirc1211]

Nice. I was having this issue thanks! 😀

[@henrikmdev]

Nice, glad it helped!

[@SlideRSB]

I prefer using a loop to consume any characters left behind in the input stream buffer.
while((c = getchar()) != '
' && c != EOF);

[@henrikmdev]

Yeah, that's one way of doing it! What about if the user enters some other white space characters other than
like I did in my example?

[@SlideRSB]

@@henrikmdev That loop will keep swallowing characters from the buffer until the new line is reached. If there is no new line in the buffer, then it will just keep swallowing until EOF is signaled.

[@henrikmdev]

Ahhh yeah, that's right!