Are types like uint32, int32, uint64, int64 defined in any stdlib header?

Question

I often see source code using types like uint32, uint64 and I wonder if they should be defined by the programmer in the application code or if they are defined in a standard

Answer 1

Those integer types are all defined in stdint.h

Answer 2

The questioner actually asked about int16 (etc) rather than (ugly) int16_t (etc).

There are no standard headers - nor any in Linux's /usr/include/ folder that define them without the "_t".

Answer 3

The C99 stdint.h defines these:

• int8_t
• int16_t
• int32_t
• uint8_t
• uint16_t
• uint32_t

And, if the architecture supports them:

• int64_t
• uint64_t

There are various other integer typedefs in stdint.h as well.

If you're stuck without a C99 environment then you should probably supply your own typedefs and use the C99 ones anyway.

The uint32 and uint64 (i.e. without the _t suffix) are probably application specific.

Answer 4

If you are using C99 just include stdint.h. BTW, the 64bit types are there iff the processor supports them.