实验二-类与对象
1.
程序1
#include<iostream>
using namespace std;
class Date
{public:
void set_date();
void show_date();
private:
int year;
int month;
int day;
};
Date d;
void Date::set_date()
{
cin >> d.year;
cin >> d.month;
cin >> d.day;
}
void Date::show_date()
{
cout << d.year << "/" << d.month <<"/" << d.day << endl;
}
int main()
{
d.set_date();
d.show_date();
}
程序3
#include<iostream>
using namespace std;
class X
{
private:
int a;//类里面不能直接初始化
int& b;
const int c;//为常数据成员，只能通过构造函数参数列表进行初始化
public:
void setA(int i) { a = i; }
X(int i,int &j,int k=0):a(i),b(j),c(k){}
X() { a = b = 0; }
X(int i, int j, int k):a(i), b(j), c(k){}//改为参数列表才可以初始化c
//void setC(int k) const
//{ c = c + k; }///c是常数据变量，不能改变
};
int main()
{
X x1;
X x2(2);
X x3(1, 2, 3);
x1.setA(3);
return 0;
}
程序2
#include<iostream>
using namespace std;
class A
{
public:
A(int i = 0) { m = i; }//构造函数没有返回类型
void show() { cout << m << endl; }
~A() {}析构函数没有返回类型
int Get_m();
private:
int m;
};
int A::Get_m()
{
m += 10;
return m;
}//返回m的值
int main()
{
A a(5);
a.Get_m();
a.show();
return 0;
}
2.
#include<iostream>
using namespace std;
class test {
public:
test();
int getint() { return num; }
float getfloat() { return f1; }
~test();
private:
int num;
float f1;
};
test::test()
{
cout << "Initalizing default" << endl;
num = 0; f1 = 0.0;
}
test::~test()
{
cout << "Destructor is active" << endl;
}
int main()
{
test array[2];
cout << array[1].getint() <<" "<< "arrr[1]输出完成" << array[1].getfloat()<<"arrr[2]输出完成" << endl;
return 0;
}
3.
#include<iostream>
using namespace std;
class Salary
{
private:
double Wage, Subsidy, Rent, WaterFee, ElecFee;//基本工资，岗位补贴，房租，水费，电费
public:
Salary() :Wage(0), Subsidy(0), Rent(0), WaterFee(0), ElecFee(0){}
Salary(double a, double b, double c, double d, double e ) :Wage(a), Subsidy(b), Rent(c), WaterFee(d), ElecFee(e){}
void Set_Wage(double a){Wage = a;}
double Get_Wage(){return Wage;}
void Set_Subsidy(double b) { Subsidy = b; }
double Get_Subsidy() { return Subsidy; }
void Set_Rent(double c) { Rent = c; }
double Get_Rent() { return Rent; }
void Set_WaterFee(double d) { WaterFee = d; }
double Get_WaterFee() { return WaterFee; }
void Set_ElecFee(double e) { ElecFee = e; }
double Get_ElecFee() { return ElecFee; }
double RealSalary()
{
return Wage + Subsidy - Rent - WaterFee - ElecFee;
}
};
void main()
{
Salary Z3;//工资清零
Salary L4(4800, 50, 20, 45, 48);//L4实际工资与消费
cout << "Z3基本工资=" << Z3.Get_Wage()<<endl;
Z3.Set_Wage(4000.258);
cout << "Z3实际基本工资=" << Z3.Get_Wage() << endl << "L4实际发放工资=" << L4.RealSalary() << "元";
}
4
#include "iostream"
using namespace std;
class intArray
{
public:
intArray(int size); //构造函数
intArray(const intArray& x); //拷贝构造函数
~intArray(); //析构函数
bool Set(int i, int elem); //设置第i个数组元素的值，设置成功返回 true，失败返回false
bool Get(int i, int& elem); //获取第i个数组元素的值，获取成功 返回true，失败返回false
int Length() const;//获取数组的长度
void Resize(int size); //重置数组
void Print(); //输出数组
private:
int* element; //指向动态数组的指针
int arraysize; //数组的大小
};
intArray::intArray(int size)
{
arraysize = size;
}
intArray::intArray(const intArray& x)
{
element = x.element;
arraysize = x.arraysize;
cout << "拷贝成功" << endl;
}
intArray::~intArray()
{
cout << "数组程序成功运行"<<endl;
}
bool intArray::Set(int i, int elem)
{
*(element + i) = elem;
if (!element)
return false;
else return true;
}
bool intArray::Get(int i, int &elem)
{
return *(element + i);
}
void intArray::Resize(int size)
{
arraysize = size;
}
void intArray::Print()
{
for (int i = 0; i < arraysize; i++)
{
cout << *(element + i) << "ends";
}
}
int intArray::Length() const
{
return arraysize;
}
#include <iostream>
using namespace std;
class Discount
{
private:
int num;//成员编号
double price;//输入价格
int quantity;//出售数量
static int n;//出售总数量
static double sum;//出售总价格
static double discount;//折扣
public:
void in();//输入数据
void count();//处理总价格
static double average();//平均价格
static void display();//展示结果
};
double Discount::sum = 0;
double Discount::discount = 0.98;
int Discount::n = 0;
void Discount::in()//输入相关变量
{
cout << "请输入售货员编码：";
cin >> num;
cout << endl << "请输入售货件数：";
cin >> quantity;
cout << endl << "请输入售货单价：";
cin >> price;
cout << endl;
}
void Discount::count()//计算总价格和出售总数量
{
if (quantity > 10)
{
sum += quantity * price * discount;
n += quantity;
}
else
{
sum += quantity * price;
n += quantity;
}
}
double Discount::average()//计算平均价格
{
return sum / n;
}
void Discount::display()
{
cout << "平均售价为" << Discount::average() << endl;
cout << "总销售款为" << sum << endl;
cout << "总销售件数为" << n << endl;
}
int main()
{
Discount d[3];
for (int j = 0; j < 3; j++)
{
cout << "第" << j + 1 << "组：" << endl;
d[j].in();
}
for (int i = 0; i < 3; i++)
{
d[i].count();
}
Discount::display();
return 0;
}
