HDU 2051 Bitset

http://acm.hdu.edu.cn/showproblem.php?pid=2051

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

代码：

#include <bits/stdc++.h>

using namespace std;

char num[3]= {'0','1'};
char ans[1111];

int main()
{
    int n;
    while(~scanf("%d",&n))
    {
        int numm=0;
        do
        {
            ans[numm++]=num[n%2];
            n/=2;
        }
        while(n!=0);
            for(int i=numm-1;i>=0;i--)
            {
                if(i!=0)
                    printf("%c",ans[i]);
                else
                    printf("%c\n",ans[i]);
            }
    }
    return 0;
}