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 a,c=0,i=0;
    for(i=0;i<16;i++){
        int d=reg;
        a=(1 & (d>>i));
        if(a==1)
        c=i;
    }
    int b;
    if(reg!=0){
     b=(1<<c);
     return b;
    }
    else
    return 0;
}

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

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

Solving Approach