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 = 0x0000;

    // Mode → bits 0–2 (3 bits)
    reg |= (mode & 0x07) << 0;

    // Speed → bits 3–7 (5 bits)
    reg |= (speed & 0x1F) << 3;

    // Reserved bits 8–9 → 0 (already 0 in reg)

    // Status → bits 10–15 (6 bits)
    reg |= (status & 0x3F) << 10;

    return reg;

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;
}