Keep Only the Highest Set Bit

Code

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

uint16_t highest_set_bit(uint16_t reg) {
    if(reg == 0)
    {
        return 0;
    }
    uint16_t mask = (1 << 15); 
    while((reg & mask) == 0)
    {
        mask >>=1;
    }
    return mask;
}

int main() {
    uint16_t reg;
    scanf("%hu", &reg);
    uint16_t result = highest_set_bit(reg);
    printf("%hu", result);
    return 0;
}

Solving Approach