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

c libc
philix picture philix · May 16, 2011 · Viewed 204.3k times · Source

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 lib header.

What's the best way to have these types on my application source code?

Answer

mu is too short picture mu is too short · May 16, 2011

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.

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