The main problem you're having is that strlen calculates the length of the string data already in the string you give it. out is not initialized when you pass it to strlen so the result is undefined.

Learning to program in C on an online platform can provide structured learning and a certification to show along with your resume. Learning C can still be useful in 2026, especially if you want to ...

How do I learn the C programming language on my Apple Mac? The C programming language has been around since the 1970s, but it has never gone out of style, and learning C is one of the best computer ...