Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg)
{
    if (reg == 0)
        return 0;
    uint16_t mask = 0x8000;
    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