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Learning from Java to C ...... What is the biggest problem?

I had experience working in Java, due to some results I need to encode in C, is it difficult to switch from Java to C? And what is the biggest difference between the two languages?

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No question, first of all, is manual memory management.

Secondly, C has no objects, so C code will tend to be structured very differently from Java code.

Edit: a little joke: about 15 years ago, when it was common for a local ISP to log on to a UNIX command line, when PPP was still fairly new, and when university campuses still had plenty of dumb terminals for UNIX servers, many had a program called fortune that will run when we log in and output a random geeky platitude, I literally laughed out loud once when I entered the message:

C is a programming language that combines the power of a language assembly with the flexibility of an assembler language.

This is ridiculous because it is true: C is an assembly language of modern computing. This is not criticism, but simply observation.

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Java is garbage collection, C is not. C has pointers; Java does not. Java methods most often use indirect use of links, and C - explicitly indicate when you pass the link. Many more considerations.

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