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) {
    // Your logic here
    uint16_t reg =0; 
    if (mode>7) mode =7; 
    if (speed>31) speed = 31; 
    if (status>63) status = 63; 
    reg|= (mode&0x07);
    reg|= (speed&0x1F)<<3;
    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;
}