Macro-Based Register Config Helper

Code

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

// Define macros here
#define BIT(n) (1 << n)
#define MASK(left, right) (((1 << (left + 1)) - 1) - ((1 << right) - 1))

#define ENMASK MASK(0, 0)
#define MODEMASK MASK(1, 2)
#define SPEEDMASK MASK(3, 5)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg = 0;
    reg |= (enable << 0);
    reg |= (mode << 1);
    reg |= (speed << 3);
    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