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 check = 1U << 15;
    uint16_t leftmost = 0;
    for(int i = 0; i < 16; i++){
        if((check >> i) & (reg)){
            leftmost = i;
            break;
        }
    }
    uint16_t ans = 1U << (15 - leftmost);
    return ans;
}

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

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

Solving Approach