Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE_BIT(r, e)    (e == 1 ? r |= 1: r &= ~1)
#define MODE_BITS(r, m)  (r |= (m << 1))
#define SPEED_BITS(r, s) (r |= s << 3)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg = 0;
    ENABLE_BIT(reg, enable);   // Modify bit 0
    MODE_BITS(reg, mode);      // Set mode bits 1 & 2
    SPEED_BITS(reg, speed);    // Clear speed bits 3,4 & 5

    return reg;

    //return 0;
}

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