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  ; 
   uint16_t res =  0b1000000000000000; 
   while( ! (res & reg ) ){
    res = res >>1 ; 
   }
   return res ; 
}

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

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

Solving Approach