Macro-Based Register Config Helper

Code

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

// Define macros here
#define SET_ENABLE_BIT(reg, enable_bit) reg|=enable_bit
#define SET_MODE_BIT(reg, mode) reg|=(mode<<1)
#define SET_SPEED_BIT(reg, speed) reg|=(speed<<3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg = 0U;
    SET_ENABLE_BIT(reg, enable);
    SET_MODE_BIT(reg, mode);
    SET_SPEED_BIT(reg, 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