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    
    uint8_t pos = 0;
    uint8_t counter = 16;
    while(counter--) if(reg & (32768 >> pos++)) break;
    uint8_t index = 16 - pos;
    return index ? (1 << index) : index;
}

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

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

Solving Approach