Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    // Your logic here
    /* clz has undefined behavior if input = 0 
    * 0-case is handled seperately
    */
    if (reg == 0)
        return 0;
    else
        return 1 <<  (31 - __builtin_clz(reg));
}

int main() {
    uint16_t reg;
    scanf("%hu", &reg);

    uint16_t result = highest_set_bit(reg);
    printf("%hu", result);
    return 0;
}

Solving Approach