Data Types : Fixed Width Integer Types (since C99)

Question

Fixed Width Integer Types (since C99)

Version ≥ C99

Answer 1

The header <stdint.h> provides several fixed-width integer type definitions. These types are optional and only provided if the platform has an integer type of the corresponding width, and if the corresponding signed type has a two's complement representation of negative values.

See the remarks section for usage hints of fixed width types.

/* commonly used types include */

uint32_t u32 = 32; /* exactly 32-bits wide */

uint8_t u8 = 255;        /* exactly 8-bits wide */ 

int64_t i64 = -65        /* exactly 64 bit in two's complement representation */