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;
    
     reg =  mode |reg;
 reg = ((speed&0x001f)<<3)|  reg&(~(((1<<5)-1)<<3)) ;

 reg =  ((status&0x003f)<<10) |  reg&(~(((1<<6)-1)<<10)) ;

     reg  =    reg&(~(((1<<2)-1)<<8)) ;
    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;
}