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

#include <stdio.h>
#include <stdint.h>
uint16_t set_bits(uint8_t reg,uint8_t val ,uint8_t msb,uint8_t lsb){
    uint8_t mask=(1U<<(msb-lsb+1))-1<<lsb;
    reg&=~mask;
    return reg|(val<<lsb);
}
uint16_t pack_register(uint8_t mode, uint8_t speed, uint8_t status) {
    // Your logic here
    uint16_t reg=0;
    reg=set_bits(reg,mode,2,0);
    reg=set_bits(reg,speed,7,3);
    reg=set_bits(reg,status,15,10);
    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;
}