Macro-Based Register Config Helper

Code

#include <stdio.h>
#include <stdint.h>

// Define macros here
#define ENABLESHIFT 0
#define  MODESHIFT  1
#define  SPEEDSHIFT 3

#define ENABLE_MASK(x)  (((x) & 0x1)<<ENABLESHIFT)
#define MODE(x)  (((x) & 0x3)<<MODESHIFT)
#define SPEED(x)  (((x) & 0x7)<<SPEEDSHIFT)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg ;
    reg |=ENABLE_MASK(enable);
    reg |=MODE(mode);
    reg |=SPEED(speed);
    return reg;
}

int main() {
    uint8_t enable, mode, speed;
    scanf("%hhu %hhu %hhu", &enable, &mode, &speed);

    uint16_t reg = build_register(enable, mode, speed);
    printf("%u", reg);
    return 0;
}

Solving Approach