Macro-Based Register Config Helper

Code

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

// Define macros here
#define SETBIT_ENABLE(reg, value)   ((value <= 1) ? reg |= (value << 0) : 0)
#define SETFIELD_MODE(reg, value)   ((value <= 4) ? reg |= (value << 1) : 0)
#define SETFIELD_SPEED(reg, value)  ((value <= 7) ? reg |= (value << 3) : 0)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t register_built = 0;
    SETBIT_ENABLE(register_built, enable);
    SETFIELD_MODE(register_built, mode);
    SETFIELD_SPEED(register_built, speed);

    return register_built;
}

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