color_union.c

#include <stdio.h>

union Color
{
    int hexcode;
    struct
    {
        unsigned char b;
        unsigned char g;
        unsigned char r;
    } rgb_s;
    unsigned char rgb[3];
};

int main(void)
{
    union Color c;
    c.hexcode = 0xfe4abb;
    printf("hexcode: %06x\n", c.hexcode);
    printf("rgb: %02x %02x %02x\n", c.rgb[2], c.rgb[1], c.rgb[0]);
    printf("rgb_s: %02x %02x %02x\n", c.rgb_s.r, c.rgb_s.g, c.rgb_s.b);
    return 0;
}