25. Pack Multiple Fields into a 16-bit Control Register

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


uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    uint16_t reg = 0;

    reg = reg | mode & 0b111;
    reg = reg | ((speed&0b11111) << 3);
    reg = reg | ((status&0x3F) << 10);


    return reg;
}

int main() {
    uint8_t mode, speed, status;
    scanf("%hhu %hhu %hhu", &mode, &speed, &status);

    uint16_t reg = pack_register(mode, speed, status);
    printf("%u", reg);
    return 0;
}