16 - 十進位制轉二進位制

Time Limit: 1000   Memory Limit: 65535 Submit: 802  Solved: 447

Description

編寫程式碼，要求：輸入引數是一個正整數，輸出該整數所對應的二進位制數對應的字串。

Input

正整數

Output

輸入的正整數對應的二進位制字串“1001”

Sample Input

9

Sample Output

1001

方法一：用陣列模擬棧

package 十進位制轉二進位制;
import java.util.Scanner;
//import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		int n,k=0;
		int []a = new int [100000];
		Scanner scanner = new Scanner(System.in);
		n = scanner.nextInt();
		if(n==0)
			System.out.println(0);
		else
		{
			while(n!=0)
			{
				a[k++] = n%2;
				n/=2;
			}
			for(int i = k - 1;i >= 0; i--)
			{
				System.out.print(a[i]);
			}
			System.out.println();
		}
	}

}
 

方法二：利用java API函式

package 十進位制轉二進位制;
import java.util.Scanner;
//import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		int n;
		Scanner scanner = new Scanner(System.in);
		n = scanner.nextInt();
		System.out.println(Integer.toBinaryString(n));
	}

}