• • 方法一：

#include <iostream>
#include<string.h>
using namespace std;
int main()
{
    char a[50];
    cin>>a;
    //求它是几位数 
    int b=strlen(a);
    cout<<b<<endl;
    //分别打印引出每位数字 
    for(int i=0;i<b;i++)
    {
        cout<<a[i]<<" ";
     } 
     cout<<endl;
     //按逆序打印出各位数字 
    for (int i=b-1;i>=0;i--)
    {
        cout<<a[i]<<" ";
    }
 } 

• • 方法二：

#include<iostream>
using namespace std;
int main()
{
    int num;
    cin>>num;
    int a,b,c,d,e;
    a=num/10000;
    b=num/1000%10;
    c=num/100%10;
    d=num/10%10;
    e=num%10;
    if(a!=0)
    {
        cout<<e<<" "<<d<<" "<<c<<" "<<b<<" "<<a<<endl;
        cout<<a<<" "<<b<<" "<<c<<" "<<d<<" "<<e<<endl; 
    }
    else if (b!=0)
    {
        cout<<e<<" "<<d<<" "<<c<<" "<<b<<endl;
        cout<<b<<" "<<c<<" "<<d<<" "<<e<<endl;
    }
    else if (c!=0)
    {
        cout<<e<<" "<<d<<" "<<c<<endl;
        cout<<c<<" "<<d<<" "<<e<<endl;
    }
    else if (b!=0)
    {
        cout<<e<<" "<<d<<endl;
        cout<<d<<" "<<e<<endl;    
    }
    else 
    {
        cout<<e<<endl;
        cout<<e<<endl;
    }
}