Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_ENABLE(val) ((uint16_t)(val & 0x01) << 0)
#define SET_MODE(val)   ((uint16_t)(val & 0x03) << 1)
#define SET_SPEED(val)  ((uint16_t)(val & 0x07) << 3)
uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg = 0;

    // Combine the fields using the Bitwise OR operator
    reg |= SET_ENABLE(enable);
    reg |= SET_MODE(mode);
    reg |= SET_SPEED(speed);
    return reg;
}

int main() {
    uint8_t enable, mode, speed;
    if (scanf("%hhu %hhu %hhu", &enable, &mode, &speed) == 3) {
        uint16_t reg = build_register(enable, mode, speed);
        printf("%u\n", reg);
    }
    return 0;
}

Solving Approach