Difference between different integer types

Question

I was wondering what is the difference between uint32_t and uint32, and when I looked in the header files it had this:

types.h:      /** @brief 32-bit unsigned integer. */     typedef unsigned int uint32; stdint.h:      typedef unsigned   uint32_t; 

This only leads to more questions: What is the difference between

unsigned varName; 

and

unsigned int varName; 

?

I am using MinGW.

Answer 1

unsigned and unsigned int are synonymous, much like unsigned short [int] and unsigned long [int].

uint32_t is a type that's (optionally) defined by the C standard. uint32 is just a name you made up, although it happens to be defined as the same thing.

Answer 2

There is no difference.

unsigned int = uint32 = uint32_t = unsigned in your case and unsigned int = unsigned always