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 highest_pos = 0;
    // Find highest bit position
    for (int i = 0; i <= 15; i++) { 
        if (reg & (1 << i)) { 
            highest_pos = i; 
        }
    }
    // Set every bit to the right of highest_pos to 0
    for (int i = 0; i < highest_pos; i++) { 
        reg &= ~(1 << i);
    }
    return reg;
}

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

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

Solving Approach