Macro-Based Register Config Helper

Code

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

// Define macros here
#define ENABLE(X) ((X & 0x01) )     // bit 0 
#define MODE(X)  ((X & 0x03) << 1)  // bits 1-2
#define SPEED(X) ((X & 0x07) << 3)  // bits 3-5

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    uint16_t temp = 0 ;
    temp |= ENABLE(enable) ;
    temp |=  MODE(mode);
    temp |= SPEED(speed);
    return temp;
}

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