Bitfields in C

bitfields.c

#include <stdio.h>
#include <stdint.h>

typedef struct {
    uint8_t foo    :4;
    uint8_t        :3;
    uint8_t bar    :1;
} foobar;

int main(int argc, char** argv) {
    foobar f = {
        .foo = 0xf,
        .bar = 0x1
    };

    printf("foo:\t%d\nbar:\t%d", f.foo, f.bar);
    /* prints:
     *
     * foo:	15
     * bar:	1
     */

    return 0;
}