Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg)
{
    uint16_t max = 0;

    for (int8_t i = 15; i >= 0; i--)
    {
        uint16_t bit = (1U << i);

        if (reg & bit)
        {
            max = bit;
            break;   // highest bit found → stop
        }
    }

    return max;
}


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

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

Solving Approach