HDU2051 Bitset

Problem Description
Give you a number on base ten,you should output it on base two.(0 < n < 1000)
 

Input
For each case there is a postive number n on base ten, end of file.
 

Output
For each case output a number on base two.
 

Sample Input

1
2
3

Sample Output

1
10
11

题意：给出一个十进制n，让你转换成二进制并输出。

#include<stdio.h>
int main()
{
	int i,k,n,a[1010]= {0};
	while(scanf("%d",&n) != EOF)
	{
		k = 0;
		for(i = 1; ; i ++)
		{
			a[i] = n % 2;
			n /= 2;
			k ++;
			if(n == 0)
				break;
		}
		for(i = k; i > 0; i --)
			printf("%d",a[i]);
		printf("\n");
	}
	return 0;
}