1.第一段代码

#include<iostream>
using namespace std;
class ClxBase{
public:
    ClxBase() {};
    ~ClxBase() {cout << 'Output from the destructor of class ClxBase!' << endl;};

    void DoSomething() { cout << 'Do something in class ClxBase!' << endl; };
};

class ClxDerived : public ClxBase{
public:
    ClxDerived() {};
    ~ClxDerived() { cout << 'Output from the destructor of class ClxDerived!' << endl; };

    void DoSomething() { cout << 'Do something in class ClxDerived!' << endl; };
};
  int   main(){  
  ClxDerived *p =  new ClxDerived;
  p->DoSomething();
  delete p;
  return 0;
  }

运行结果：

Do something in class ClxDerived!   

#include<stdio.h>
void main()
{
   int a,b,c1,c2,c3,c4,c5;
   printf('请输入一个5位以内的正整数(0~99999):');
   scanf(']',&a);
   c1 = a % 10;
   c2 = (a - c1) % 100 / 10;
   c3 = (a - c1 - c2 * 10) % 1000 / 100;
   c4 = (a - c1 - c2 * 10 - c3 * 100) % 10000 / 1000;
   c5 = (a - c1 - c2 * 10 - c3 * 100 - c4 * 1000) % 100000 / 10000;
   if(a < 10)
    b = 1;
   else if(a < 100)
    b = 2;
   else if(a < 1000)
    b = 3;
   else if(a < 10000)
    b = 4;
   else b = 5;
   switch(b)
   {
    case 1:
     printf('%d\n',c1);
     printf('%d%\n',c1);
 &nbs