C++ prime 第七章_c++的slt 对应c++prime哪一章-优快云博客

本文展示了如何在C++中处理销售数据，通过合并相同书号的记录并计算累计销售量、销售额和平均价格。使用了类和结构，如Sales_data，实现输入验证、数据合并和输出格式化。

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7.1


#include <iostream>
#include<string>
#include<vector>
using namespace std;

struct Sales_data
{
	string bookNo;
	unsigned units_sold;
	double revenue;
	Sales_data()
	{
		
	    units_sold = 0;
		revenue = 0.0;
	}
	

};

int main(int argc, char* argv[])
{
	cout << "请输入一本书的 书序列号 销售量 销售额" << endl;
	Sales_data currBook;
	Sales_data nextBook;
	if (cin >> currBook.bookNo >> currBook.units_sold >> currBook.revenue)
	{
		cout << "请输入另一本书的 书序列号 销售量 销售额" << endl;
		while (cin >> nextBook.bookNo >> nextBook.units_sold >> nextBook.revenue)
		{
			if (currBook.bookNo == nextBook.bookNo)
			{
				currBook.units_sold += nextBook.units_sold;
				currBook.revenue += nextBook.revenue;

			}
			else
			{
				cout << currBook.bookNo << " 销售量为  :" << currBook.units_sold  << "  " << "销售额为  :" << currBook.revenue << endl;
				currBook = nextBook;
			}
			cout << currBook.bookNo << " 销售量为  :" << currBook.units_sold  << "  " << "销售额为  :" << currBook.revenue << endl;
		}
	}
	else
	{
		cerr << "No data" << endl;
	}

	cin.get();
}

7.6 7.7


#include <iostream>
#include<string>
#include<vector>
using namespace std;

struct Sales_data
{
	string bookNo;
	unsigned units_sold;
	double revenue;
	double avg_price() const;
	Sales_data()
	{
		
	}

	Sales_data& combine(const Sales_data &rhs)
	{
		units_sold += rhs.units_sold;
		revenue += rhs.revenue;
		return *this;
	}
	string isbn() const 
	{
		return this->bookNo;
	}
	istream& read(istream& is, Sales_data& item)
	{
		double price = 0;
		is >> item.bookNo >> item.units_sold >> price;
		item.revenue = price * item.units_sold;
		return is;
	}
	ostream& print(ostream& os, const Sales_data& item)
	{
		os << "书好 ： " << item.isbn() << "销量 ： " << item.units_sold <<
			"销售额： " << item.revenue << "均价: " << item.avg_price();
		return os;
	}
	Sales_data add(const Sales_data& lhs, const Sales_data& rhs)
	{
		Sales_data sum = lhs;
		sum.combine(rhs);
		return sum;
	}

};
double Sales_data::avg_price() const {
	if (units_sold) {
		return revenue / units_sold;
	}
	else return 0;
}

class Person
{
private:
	string name;
	string address;
public:
	
	
	Person()
	{

	}
	void Show_info(string name , string address)
	{
		cout << name << " 的地址是 " << address << endl;
	}
	string  getname() const
	{
		return this -> name;
	}
	string getaddress() const
	{
		return this -> address;
	}


};





int main(int argc, char* argv[])
{
	cout << "请输入一本书的 书序列号 销售量 销售额" << endl;
	Sales_data currBook;
	Sales_data nextBook;
	if (currBook.read(cin , currBook))
	{
		cout << "请输入另一本书的 书序列号 销售量 销售额" << endl;
		while (currBook.read(cin,nextBook))
		{
			if (currBook.isbn() == nextBook.isbn())
			{
				currBook.combine(nextBook);
				//currBook.units_sold += nextBook.units_sold;
				//currBook.revenue += nextBook.revenue;

			}
			else
			{
				currBook.print(cout, currBook);
				cout << endl;
				currBook = nextBook;
				/*cout << currBook.bookNo << " 销售量为  :" << currBook.units_sold  << "  " << "销售额为  :" << currBook.revenue 
					<<  "平均价格： " <<  currBook.avg_price() << endl;
				currBook = nextBook;*/
			}
			currBook.print(cout, currBook);
			cout << endl;
			/*cout << currBook.bookNo << " 销售量为  :" << currBook.units_sold  << "  " << "销售额为  :" << currBook.revenue 
				<< "平均价格： " << currBook.avg_price() << endl;*/
		}
	}
	else
	{
		cerr << "No data" << endl;
	}


	//Person My_person;
	//My_person.Show_info("Mr.Lei", " aluba");

	cin.get();
}

7.11


#include <iostream>
#include<string>
#include<vector>
using namespace std;

class Sales_data {
public:
	Sales_data() = default ;
	Sales_data(const std::string bN) :bookNo(bN), units_sold(0), revenue(0) {}
	Sales_data(const std::string bN, unsigned sold) :bookNo(bN), units_sold(sold), revenue(0) {}
	Sales_data(const std::string bN, unsigned sold, double reven) :bookNo(bN), units_sold(sold), revenue(reven) {}
	std::string isbn() const { return bookNo; }
	unsigned getUnits_sold() const { return units_sold; }
	double getRevenue() const { return revenue; }
	Sales_data& combine(const Sales_data&);
	
private:
	std::string bookNo;
	unsigned units_sold;
	double revenue;
};

Sales_data& Sales_data::combine(const Sales_data& rhs) {
	units_sold += rhs.units_sold;
	revenue += rhs.revenue;
	return *this;
}
//double Sales_data::avg_price() const {
//	if (units_sold) {
//		return revenue / units_sold;
//	}
//	else return 0;
//}



int main(int argc, char* argv[])
{
	Sales_data A;
	Sales_data B("0-1-2222-3");
	Sales_data C("0-1-2222-4", 20);
	Sales_data D("0-1-33333-5", 24, 66);

	cout << A.isbn() << "  " << A.getUnits_sold() << "  " << A.getRevenue() << "  " << endl;
	cout << B.isbn() << "  " << B.getUnits_sold() << "  " << B.getRevenue() << "  " <<  endl;
	cout << C.isbn() << "  " << C.getUnits_sold() << "  " << C.getRevenue() << "  " <<  endl;
	cout << D.isbn() << "  " << D.getUnits_sold() << "  " << D.getRevenue() << "  " <<  endl;
	//Person My_person;
	//My_person.Show_info("Mr.Lei", " aluba");

	cin.get();
}

7.27


#include <iostream>
#include<string>
#include<vector>
using namespace std;

class Screen 
{


public:
	using pos = string::size_type;
	Screen() = default;
	Screen(pos ht , pos wd) : height(ht) , width(wd) , contents(ht * wd , ' '){}
	Screen(pos ht, pos wd, char c) :height(ht), width(wd), contents(ht* wd, c)
	{

	}
	
	Screen& set(char);
	Screen& set(pos, pos, char);
	Screen& move(pos, pos);

	char get() const { return contents[cursor]; }
	char get(pos r, pos c) const { return contents[r * width + c]; }

	Screen &display(ostream& os)
	{
		do_display(os);
		return *this;
	}
	const Screen& display(ostream& os)const
	{
		do_display(os);
		return *this;
	}
	void do_display(ostream& os) const { os << contents; }
private:
	pos height = 0;
	pos width = 0;
	string contents;
	pos cursor = 0;
};

inline Screen &Screen::set(char c) 
{
	contents[cursor] = c;
	return *this;
}

inline Screen& Screen::set(pos r, pos col, char ch)
{
	contents[r * width + col] = ch;
	return *this;
}

inline Screen& Screen::move(pos r, pos c) {
	cursor = r * width + c;
	return *this;
}

int main(int argc, char* argv[])
{
	Screen My_screen(5 , 5 , 'X');
	My_screen.move(4, 0).set('#').display(cout);
	cout << "\n";
	My_screen.display(cout);
	cout << "\n";
	

	cin.get();
}