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What's the best way to declare an integer type which is always 4 byte on any platforms? I don't worry about certain device or old machines which has 16-bit int.
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A signed integer is a 32-bit datum that encodes an integer in the range [-2147483648 to 2147483647]. An unsigned integer is a 32-bit datum that encodes a nonnegative integer in the range [0 to 4294967295]. The signed integer is represented in twos complement notation.
32-bit signed integer type is used to store negativ or pozitiv whole number. 32-bit integer and his value range: from -2147483648 to 2147483647.
Microsoft C/C++ features support for sized integer types. You can declare 8-, 16-, 32-, or 64-bit integer variables by using the __intN type specifier, where N is 8, 16, 32, or 64.
Pointers. The ARMv7-M architecture used in mbed microcontrollers is a 32-bit architecture, so standard C pointers are 32-bits.
int is 32 bits in size. long , ptr , and off_t are all 64 bits (8 bytes) in size.
#include <stdint.h> int32_t my_32bit_int; C doesn't concern itself very much with exact sizes of integer types, C99 introduces the header stdint.h , which is probably your best bet. Include that and you can use e.g. int32_t. Of course not all platforms might support that.
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