C++面向对象实验（二）

#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<string>
#include<cstdlib>
#include<algorithm>
using namespace std;
class Student {
  char name[15];
  int english;
  int computer;
  int total;
public:
  void input();
  void display();
  friend void Sort(Student *T, int n);
  Student& operator=(const Student &T);
};

void Student::input()
{
  cout << "输入名字：";
  cin >> name;
  cout << "输入英文成绩：";
  cin >> english;
  cout << "输入计算机成绩：";
  cin >> computer;
  total = english + computer;
}

void Student::display()
{
  
  cout << "名字:" << name << endl;
  cout << "英语成绩:" << english << endl;
  cout << "计算机成绩:" << computer << endl;
  cout << "总成绩:" << total << endl;
}

Student& Student::operator=(const Student &T)
{
  if (this == &T)
    return *this;
  
  strcpy(name, T.name);
  english = T.english;
  computer = T.computer;
  total = T.total;
  return *this;
}
 
void Sort(Student *T, int n)
{
  int biao = 0;
  
  for (int i = 0; i < n - 1; i++)
  {
    biao = 0;
    for (int j = n - 2 ; j >= 0; j--)
    {
      if (T[j+1].total > T[j].total)
      {
        swap(T[j],T[j+1]); 
        biao = 1;
      }
      if (!biao)
        break;
    }
  } 
  
} 
int main()
{
  int n;
  cout << "输入学生人数：";
  cin >> n;
  Student *p = new Student[n];
  for (int i = 0; i < n; i++)
    p[i].input();    
  Sort(p,n);  
  for (int i = 0; i < n; i++)
    p[i].display(); 
  
  return 0;
}

#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<string>
#include<cstdlib>
#include<algorithm>
using namespace std;

class Point {
  int x;
  int y;
public:
  Point(int x1, int y1) : x(x1), y(y1) { }
  friend double getDistance(const Point &p1, const Point &p2);
};

double getDistance(const Point &p1, const Point &p2)
{
  double x = p1.x - p2.x;
  double y = p1.y - p2.y;
  return sqrt(pow(x, 2) + pow(y, 2));
}

int main()
{
  int x, y;  
  cin >> x >> y;
  Point p1(x,y);
  x = y = 0;  
  cin >> x >> y;
  Point p2(x,y);
  cout << "距离:" << getDistance(p1, p2);
  return 0;
}

#include<iostream>
#include<cstdlib>
#include<cstdio>
#include<cmath>
#include<cstring>
#include<string>
#include<cstdlib>
#include<algorithm>
using namespace std;

class Time {
  int hour;
  int minute;
  int second;
public:
  Time(int hour1, int minute1, int second1) : hour(hour1), minute(minute1), second(second1) { }
  friend int relSecond(Time &t1, Time &t2);
};

int relSecond(Time &t1, Time &t2)
{
  int sec1 = t1.hour * 3600 + t1.minute * 60 + t1.second;
  int sec2= t2.hour * 3600 + t2.minute * 60 + t2.second;
  if (sec1 >= sec2)
    return sec1 - sec2;
  else
    return sec2 - sec1;
}
int main()
{
  int hour, minute, second;  
  cin >> hour >> minute >> second;
  Time t1(hour, minute, second);
  hour = minute = second = 0;
  cin >> hour >> minute >> second;
  Time t2(hour, minute, second);
  cout << "相差的秒数为:" << relSecond(t1, t2) << endl;
  return 0;
}