题解 | #十进制数转二进制数#withStringBuilder

import java.util.*;

public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int num = scanner.nextInt();

    //write your code here......
    StringBuilder sb = new StringBuilder();
    sb.append(num%2);
    while((num/=2)>0) {
        sb.insert(0, num%2);
    }
    System.out.println(sb);

}

}