Fixed widths

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Fixed widths#

The portable arithmetic types live in <stdint.h>. The operator writes these by default for anything beyond local counters.

#include <stdint.h>

int8_t   a;     uint8_t  b;
int16_t  c;     uint16_t d;
int32_t  e;     uint32_t f;
int64_t  g;     uint64_t h;

The size-flavoured semantics types.

intptr_t  ip;   /* signed integer wide enough to hold a pointer */
uintptr_t up;
size_t    n;    /* unsigned, wide enough for any array index */
ptrdiff_t d2;   /* signed, the difference between two pointers */

Format specifiers for these are in <inttypes.h>.

#include <inttypes.h>
uint64_t v = 1234;
printf("%" PRIu64 "\n", v);

References#

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