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;
    }
    else
    {
        reg|=(reg>>1);
        reg|=(reg>>2);
        reg|=(reg>>4);
        reg|=(reg>>8);
    }
    return (reg ^ (reg>>1));
}
int main() 
{
    uint16_t reg;
    scanf("%hu", &reg);
    uint16_t result = highest_set_bit(reg);
    printf("%hu", result);
    return 0;
}

Solving Approach