Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {

  int pos = 0;
  int v = reg;

  while (v >>= 1) {
    ++pos;
  }

  return reg & ~((1 << pos) - 1);
}

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

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

Solving Approach