實驗二

1、函數重載框架練習

 

#include <iostream>
using namespace std;
struct complex{
 double real;
 double imaginary;};
 int add(int a,int b)
 {return a+b;}
 double add(double a,double b)
 {return a+b;}
 complex add(complex a,complex b)
 {complex x;
 x.real=a.real+b.real;
 x.imaginary=a.imaginary+b.imaginary;
 return x;}

int main()
 {cout<<"1+2="<<add(1,2)<<endl;
 cout<<"1.2+3.4="<<add(1.2,3.4)<<endl;
 cout<<"(1+3i)+(2+4i)="<<add(1,2)<<"+"<<add(3,4)<<"i"<<endl;
 }

 

2、快速排序

 

#include<iostream>
using namespace std;
void QuickSort(double a[], int left,int right)
{if(left<right) 
 {int i=left; 
 int j=right; 
 double x=a[i]; 
 while(i<j) 
  {while(i<j&&a[j]>x) 
   j--; 
   if(i<j)
  {a[i]=a[j]; 
   i++;} 
 while(i<j&&a[i]<x) 
 i++; 
 if(i<j)
  {a[j] = a[i]; 
  j--;}} 
  a[i]=x; 
  QuickSort(a, left, i-1); 
  QuickSort(a, i+1, right); 
}} 

int main()
 {int i,k;
 double a[100];
 char s;
 for(i=0;i<100;i++)
 {cin>>a[i];
 if(getchar()=='\n')break;else k++;}
 QuickSort(a,0,i-1);
 cout<<"排序后的數為: ";
 for(i=0;i<k;i++) 
 cout<<a[i]<<' ';
 cout<<endl; 
 return 0;
 }

 

3、類的定義、實現與使用

 

#include <iostream> 
#include <string> 
using namespace std;
class User
 {public: 
   User(string name1, string passwd1, string email1);
   User(){
   name="";
   passwd="111111";
   email="";}
   void setInfo(string name1="",string passwd1="111111",string email1="");
   void changePasswd(); 
   void printInfo(); 
 private: 
   string name; 
   string passwd; 
   string email;};

   void User::setInfo(string name1,string passwd1,string email1)
   {if (name == " ")cin>>name1;
    name=name1;
    if(passwd == " ")cin>>passwd1;
    passwd=passwd1;
    if(email == " ")cin>>email1;
    email=email1;
    }

 void User::changePasswd(){
  string oldpasswd;
  int n=1;
  cout<<"請輸入原密碼:";
  cin>>oldpasswd; 
  while(oldpasswd!=passwd)
  {cout<<"錯誤，請重試:";
  cin>>oldpasswd;
  n++;}
  if(oldpasswd==passwd)
  {cout<<"請輸入新密碼:";
  cin>>passwd;}
 }

 void User::printInfo(){
  cout<<"姓名: "<<name<<endl;
  cout<<"密碼:******"<<endl;
  cout<<"email: "<<email<<endl;
  cout<<endl;}

int main() 
 {User user1; 
 user1.setInfo("Leonard"); 
 user1.printInfo(); 
 user1.changePasswd(); 
 user1.printInfo(); 
 User user2; 
 user2.setInfo("Jonny","92197","[e-mail]"); 
 user2.printInfo();
 return 0;}