Keep Only the Highest Set Bit

Code

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

#define max(a, b) (a > b) ? a : b

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    // Your logic here
    int max_i = 0;
    for (int i = 0; i < sizeof(reg)*8; i++) {
        if (reg & (1 << i)) max_i = max(max_i, i);
    }
    return max_i ? (1 << max_i) : 0;
}

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

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

Solving Approach