Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    // keep checking for set bits
    // if bit set, save bit pos
    uint16_t highestBitPos = 0;
    for (int i = 0; i < 16; i++){
        if (reg & (1U<<i)){
            highestBitPos = i;
        }
    }
    // then AND with mask (1U<<bitPos)

    return reg & (1U<<highestBitPos);
}

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

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

Solving Approach