Macro-Based Register Config Helper

Code

#include <stdio.h>
#include <stdint.h>
int reg=0;
// Define macros here
#define ENABLE reg|=(1<<0)
#define MODE(i) reg|=(i<<1)
#define SPEED(i) reg|=(i<<3)


uint16_t build_register(uint8_t enable, uint8_t mode, uint8_t speed) {
    // Use macros to set fields
    if(enable==1)
    ENABLE;
    else
    reg=reg&~(1<<0);
    MODE(mode);
    SPEED(speed);
    reg=reg&~(1<<6);
    reg=reg&~(1<<7);


    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