Keep Only the Highest Set Bit

Code

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

uint16_t keepHighestBit(uint16_t n) {
    if (n == 0) return 0;
    n |= (n >> 1);
    n |= (n >> 2);
    n |= (n >> 4);
    n |= (n >> 8);
    return n - (n >> 1);
}

int main() {
    uint16_t n;
    scanf("%hu", &n);
    printf("%hu\n", keepHighestBit(n));
    return 0;
}

Solving Approach