Difference between int and signed int declaration

Question

I am reading some tutorials on embedded programming and one of them says int and signed int are different but does not explain how or why.

Answer 1

As far as I know the difference exists only for char data type. Where char a; can be signed char a; or unsigned char a; depending on compiler options. As this article says. (--signed_chars) For int data types, there is no difference between int and signed int.