Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    // Your logic here
    if (reg == 0){
        return 0;
    }
    uint16_t ans = 0;
    int idx = 0;
    for (int i=0; i<16; i++){
        if (reg&1){
            idx = i;
        }
        reg >>= 1;
    }
    return ans | (1 << idx);
}

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

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

Solving Approach