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
    int i=15;
    int flag = 0;
    while(i >= 0){
        if(reg & (1U << i)){
            flag =1;
        }
        i--;
        if(flag == 1) break;
    }
    for(int j=0;j<i+1;j++){
        reg &= ~(1U << j);
    }
    return reg;
}

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

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

Solving Approach