c - Are there fixed size integers in GCC? -

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on msvc++ compiler, 1 can use __int8, __int16, __int32 , similar types integers specific sizes. extremely useful applications need work low-level data structures custom file formats, hardware control data structures , like.

is there similar equivalent can use on gcc compiler?

iso standard c, starting c99 standard, adds standard header <stdint.h> defines these:

uint8_t  - unsigned 8 bit int8_t   - signed 8 bit uint16_t - unsigned 16 bit int16_t  - signed 16 bit uint32_t - unsigned 32 bit int32_t  - signed 32 bit uint64_t - unsigned 64 bit int64_t  - signed 64 bit

i use these types time.

these types defined if implementation supports predefined types appropriate sizes , characteristics (which do).

<stdint.h> defines types names of form (u)int_leastn_t (types have at least specified width) , (u)int_fastn_t (the "fastest" types have @ least specified width); these types mandatory.

if you're using old implementation doesn't support <stdint.h>, can roll own; 1 implementation doug gwyn's "q8".


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