Macro-Based Register Config Helper

Code

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

// Alternative macro definitions that might be clearer for beginners
#define ENABLE_BIT(val) ((val) & 1)               // Bit 0
#define MODE_BITS(val) (((val) & 3) << 1)         // Bits 1-2  
#define SPEED_BITS(val) (((val) & 7) << 3)        // Bits 3-5

uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    uint16_t reg = 0;
    
    reg = reg | ENABLE_BIT(enable);   // Add enable bit
    reg = reg | MODE_BITS(mode);      // Add mode bits
    reg = reg | SPEED_BITS(speed);    // Add speed bits
    
    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