Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) 
{
    if (reg == 0)
    {
        return 0;
    }
    
    uint8_t pos = 0;
    if (reg >= (1 << 8))
    {
        reg >>= 8;
        pos += 8;
    }

    if (reg >= (1 << 4))
    {
        reg >>= 4;
        pos += 4;
    }
    
    if (reg >= (1 << 2))
    {
        reg >>= 2;
        pos += 2;
    }

    if (reg >= (1 << 1))
    {
        reg >>= 1;
        pos += 1;
    }

    return (uint16_t)(1 << pos);
}

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

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

Solving Approach