Macro-Based Register Config Helper

Code

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

// Define macros here
#define GET_ENABLE(reg)   ((reg) & 0x1)
#define GET_MODE(reg)     (((reg) >> 1) & 0x3)
#define GET_SPEED(reg)    (((reg) >> 3) & 0x7)

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

    // Set ENABLE (1 bit at position 0)
    reg |= (enable & 0x1) << 0;

    // Set MODE (2 bits at positions 1–2)
    reg |= (mode & 0x3) << 1;

    // Set SPEED (3 bits at positions 3–5)
    reg |= (speed & 0x7) << 3;

    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