Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
   int i,a;
   if(reg==0) return 0;
   else{
   for(i=0;i<16;i++){
    if(reg & (1<<i)){
        a=i;
    }
   }
   reg=0;
   reg=reg | (1<<a);
    return reg;}
}

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

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

Solving Approach