Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE_POS 0
#define MODE_POS   1
#define SPEED_POS  3

// Field masks (bit widths)
#define ENABLE_MASK 0x1   // 1 bit
#define MODE_MASK   0x3   // 2 bits
#define SPEED_MASK  0x7   // 3 bits

// Macros to set fields
#define SET_ENABLE(val)   (((val) & ENABLE_MASK) << ENABLE_POS)
#define SET_MODE(val)     (((val) & MODE_MASK)   << MODE_POS)
#define SET_SPEED(val)    (((val) & SPEED_MASK)  << SPEED_POS)
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);

    // RESERVED (bits 6–7) remain 0 automatically
    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