Keep Only the Highest Set Bit

Code

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

// Complete the function
uint16_t highest_set_bit(uint16_t reg) {
    uint16_t highest = 0;
    if(reg == 0) return 0;
    // Iterate from highest bit (15) to lowest bit (0)
    for(uint8_t i = 15; i >= 0; i--){
        if(reg & (1<<i)){ // Check if the i-th bit is set
            highest = (1<<i);  
            break; // Exit loop after finding the highest set bit
        }
    }
    return highest;
}

int main() {
    uint16_t reg;
    scanf("%hu", &reg); // %hu: unsigned short: 16 bits
    printf("%hu", highest_set_bit(reg));
    return 0;
}

Solving Approach