Macro-Based Register Config Helper

Code

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

// Define macros here
// Enable bit (1 bit at position 0)
#define ENABLE_SHIFT   0
#define SET_ENABLE(val)    (((val) & 0x1) << ENABLE_SHIFT)

// Mode field (2 bits at positions 1–2)
#define MODE_SHIFT     1
#define SET_MODE(val)      (((val) & 0x3) << MODE_SHIFT)

// Speed field (3 bits at positions 3–5)
#define SPEED_SHIFT    3
#define SET_SPEED(val)     (((val) & 0x7) << SPEED_SHIFT)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t reg = 0;
    reg |= SET_ENABLE(enable);
    reg |= SET_MODE(mode);
    reg |= SET_SPEED(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