Question

用户输入一个十进制数，转换为二进制数后输出

用JCreatot 编写.java文件，

Answer 1

Scanner s=new Scanner(System.in);
int num=s.nextInt();
System.out.println(Integer.toBinaryString(num));

Answer 2

http://hi.baidu.com/udking_love/blog/item/a0dda425c124f66634a80f5b.html

Answer 3

测试通过

import java.io.*;
public class test
{
public static void main(String arg[])
{
test a=new test();
System.out.print("请输入一个十进制整数:");
try
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
int i=Integer.parseInt(br.readLine());
System.out.print("该数的二进制数是：");
a.BinaryString(i);
System.out.println();
System.out.print("该数的八进制数是：");
a.OctalString(i);
System.out.println();
System.out.print("该数的十六进制数是：");
a.HexString(i);
System.out.println();
}catch(IOException e)
{
System.err.println(e.toString());
}

}
public void BinaryString(int x)
{
if(x>0)
BinaryString(x/2);
else
return;
System.out.print(x%2);
}
public void OctalString(int x)
{
if(x>0)
OctalString(x/8);
else
return;
System.out.print(x%8);
}
public void HexString(int x)
{
if(x>0)
BinaryString(x/16);
else
return;
if(x%16==10)
{
System.out.print("A");
}
else if(x%16==11)
{
System.out.print("B");
}
else if(x%16==12)
{
System.out.print("C");
}
else if(x%16==13)
{
System.out.print("D");
}
else if(x%16==14)
{
System.out.print("E");
}
else if(x%16==15)
{
System.out.print("F");
}
else
System.out.print(x%16);
}
}

我的输出结果

请输入一个十进制整数:8
该数的二进制数是：1000
该数的八进制数是：10
该数的十六进制数是：8