Keep Only the Highest Set Bit

Code

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

// Function to return the highest set bit
uint16_t highest_set_bit(uint16_t reg) {
    if (reg == 0) return 0; // edge case: no bits set

    int pos = 0;
    while (reg > 0) {
        reg >>= 1;
        pos++;
    }

    return (1 << (pos - 1));
}

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

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

Solving Approach