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There is absolutely no difference. The trailing comma is just a syntactic convenience, as alluded by Zoppo.
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Given struct A, what is the difference between these two initializations?<br />
<br />
//begin code<br />
<br />
C c1 = {0};<br />
<br />
C c2 = {0,};<br />
<br />
//end code<br />
<br />
Yes, I see some places where they initialize with a zero and a comma.
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Given struct A, what is the difference between these two initializations?

//begin code

C c1 = {0};

C c2 = {0,};

//end code

Yes, I see some places where they initialize with a zero and a comma.

Initialize struct in C

C is a general-purpose, imperative computer programming language, supporting structured programming, lexical variable scope and recursion, while a static type system prevents many unintended operations. By design, C provides constructs that map efficiently to typical machine instructions, so it has found lasting use in applications that had formerly been coded in assembly language, including operating systems as well as various application software for computers ranging from supercomputers to embedded systems. It is distinct from C++ (which has its roots in C) and C#, and many later languages have borrowed directly or indirectly from C.