Keep Only the Highest Set Bit

#include<stdio.h>
#include<stdint.h>
uint16_t highest_set_bit(uint16_t reg){
    uint16_t result=0;
    if(reg==0)
    result=0;
    else{
    result=1U<<15;
    while((reg&result)==0){
    result=result>>1;
    }
    }
    return result;
}

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