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
    uint8_t maxPos = 0;
    uint16_t mask = 0;
    
    if (reg == 0)
    {
        return 0;
    }

    for (int i = 0; i < 16; i++)
    {
        if (reg & (1 << i))
        {
            maxPos = i;
        }
    }
    
    mask |= (1 << maxPos);
    return mask;
}

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

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

Solving Approach