（位运算）将十进制转换成二进制打印出来
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner myScanner = new Scanner(System.in);
int num = myScanner.nextInt();
getBinary(num);
}
public static void getBinary(int num) {
char ch;
for (int i = 31; i >= 0; i--) {
ch = ((1 & (num >> i)) == 0) ? '0' : '1';
IO.print(ch);
}
}
}
