Macro-Based Register Config Helper

Code

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

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

// Masks (for safety)
#define ENABLE_MASK  (0x01 << ENABLE_POS)   // 1 bit
#define MODE_MASK    (0x03 << MODE_POS)     // 2 bits
#define SPEED_MASK   (0x07 << SPEED_POS)    // 3 bits

// Field setters
#define SET_ENABLE(x)   (((x) & 0x01) << ENABLE_POS)
#define SET_MODE(x)     (((x) & 0x03) << MODE_POS)
#define SET_SPEED(x)    (((x) & 0x07) << SPEED_POS)

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
     uint16_t reg = 0;

    reg |= SET_ENABLE(enable);
    reg |= SET_MODE(mode);
    reg |= SET_SPEED(speed);

    return reg;   // upper bits (6–7) remain 0 as required
}

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