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
    // 10101010
    if (reg){
        uint8_t pos = 0;
        while (pos < 16 && (reg >> pos)) {
            pos += 1;
        }
        reg &= 1U << (pos - 1);
    }
    return reg;
}

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

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

Solving Approach