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|= (status & 0x3f);
    reg = reg <<7;
    reg |= (speed &0x1f);
    reg =reg<< 3;
    reg |=(mode & 0x07);
    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;
}