分离正整数中的各位数

<img src="http://img.blog.csdn.net/20141117102843535?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvSV9fQW1fX0xlZ2VuZA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" /><pre class="cpp" name="code">#include <iostream>
using namespace std;
int main()
{
    int a,b;
    while (cin>>a)
    {
        do
        {
            b=a%10;
            a=a/10;
            cout<<b<<" ";
        }
        while (a!=0);

        cout<<endl;
    }
    return 0;
}