Languages/C/inttypes
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=== HI TECH PIC18 C compiler === | === HI TECH PIC18 C compiler === | ||
There is no <code>(u)int64_t</code>. | There is no <code>(u)int64_t</code>. | ||
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| + | [[Category:Languages]] [[Category:C]] | ||
Revision as of 07:17, 12 July 2012
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Integer types in C
The C language defines a lot of integer types (char, short, int, unsigned int,...)
but unfortunatly there size depends on the platform (or compiler).
Writing programs in a portable manner requires the use of known size.
C99 integer sizes
Recent compilers provide the <stdint.h> file that defines a lot of integer types, and because this is a standard, new code should no more use the "old" HEVs coding style.
| C99 type | Old HEVs type | size (bits) | minimum value (define) | minimum value (numeric) | maximum value (define) | maximum value (numeric) |
| uint8_t | UINT8 | 8 | - | 0 | UINT8_MAX | 255 |
| uint16_t | UINT16 | 16 | - | 0 | UINT16_MAX | 65'535 |
| uint32_t | UINT32 | 32 | - | 0 | UINT32_MAX | 4'294'967'295 |
| uint64_t | UINT64 | 64 | - | 0 | UINT64_MAX | 18'446'744'073'709'551'615 |
| int8_t | INT8 | 8 | INT8_MIN | -128 | UINT8_MAX | 127 |
| int16_t | INT16 | 16 | INT16_MIN | -3'2768 | UINT16_MAX | 32'767 |
| int32_t | INT32 | 32 | INT32_MIN | -2'147'483'648 | UINT32_MAX | 2'147'483'647 |
| int64_t | INT64 | 64 | INT64_MIN | -9'223'372'036'854'775'807 | UINT64_MAX | 9'223'372'036'854'775'807 |
Compiler support & remarks
GCC
gcc fully supports <stdint.h>.
HI TECH PIC18 C compiler
There is no (u)int64_t.
