Recently I had following test question:

Why would one ever write:
struct S { int x; } instead of just “int” ?

E.g.
“void Foo(S);” or “S Bar(S);”

instead of:

“void Foo(int);” or “int Bar(int)”

Do you have some ideas?
Thanks.

Doing this can increase code readability. Say you've a program that does arithmetic on vectors and matrices. Being a clever coder, you use dynamically allocated memory, and use pointers to access. But a pointer to a vector will look identical to a matrix. A function multiplying 2 matrices gives a matrix, but matrix by a vector gives a vector.

So the code would be like:
Pretty hard to read this, eh? But use structs, and things become a lot easier to read:
A lot easier to comprehend! (Not note, C doesn't allow function overloading)

GF