Technische Informatik; Hardwarenahe Programmierung
Beispiel uint8_t¶
uint8_t in Hederdatei <inttypes.h> oder bei MSVC <stdint.h>
u unsigned (also nur positive Zahlen, keine negativen) uint unsigned int (also nur ganze positive Zahlen) uint8 mit 8 Bit (also: 0 bis 255 ist char) uint8_t das _t steht für: mit typedef definierter Aliasname für einen Datentyp (hier für unsigned char).
Type Keyword Bytes Range character char 1 -128 .. 127 unsigned character unsigned char 1 0 .. 255 integer int 2 -32 768 .. 32 767 short integer short 2 -32 768 .. 32 767 long integer long 4 -2 147 483 648 .. 2 147 483 647 unsigned integer unsigned int 2 0 .. 65 535 unsigned short integer unsigned short 2 0 .. 65 535 unsigned long integer unsigned long 4 0 .. 4 294 967 295 single-precision floating-point (7 Stellen) float 4 1.17E-38 .. 3.4E38 double-precision floating-point (19 Stellen) double 8 2.2E-308 .. 1.8E308
Keyword Bytes Range C-Entsprechung (gcc) int8_t 1 −128 .. 127 signed char int16_t 2 −32768 .. 32767 signed short, signed int int32_t 4 −2147483648 .. 2147483647 signed long int64_t 8 −9223372036854775808 .. 9223372036854775807 signed long long
Keyword Bytes Range C-Entsprechung (gcc) uint8_t 1 0 ..255 unsigned char uint16_t 2 0 .. 65535 unsigned short, unsigned int uint32_t 4 0 .. 4294967295 unsigned long uint64_t 8 0 .. 18446744073709551615 unsigned long long
Character Type Output format C, c int a single-byte character d int Signed decimal integer. i int Signed decimal integer. o int Unsigned octal integer. u int Unsigned decimal integer. X, x int Unsigned hexadecimal integer E, e, f, G, g double Signed value; form [–]d.dddd e [-]dd[d] p Pointer Prints the address of the argument in hex. S, s String specifies a single-byte–character string.
Franz Pucher