第十章编程练习答案

10.1为复习题5类提供定义，并演示

//10.1为复习题5类提供定义，并演示
#include 
  
   
using namespace std;

class BankAccount
{
	string		m_name;
	string		m_num;
	unsigned	m_balance;	
public:
	BankAccount (string name, string num, unsigned balance)
{
	m_name = name;
	m_num = num;
	m_balance = balance;
}
	void show () const
{
	cout << m_name << endl;
	cout << m_num << endl;
	cout << m_balance << endl;
}
void incDeposit (unsigned amount)
{
	m_balance += amount;
}

void decDeposit (unsigned amount)
{
	if (m_balance <= amount)
		m_balance = 0;
	else
		m_balance -= amount;
}
};

int main () 
{     
	BankAccount bank("Tom", "1", 1024);
	bank.show();
	bank.incDeposit(128);
	bank.show();
	bank.decDeposit(2048);
	bank.show();
} 
  

10.2根据以下类定义和例子，完成类方法定义

//10.2根据以下类定义和例子，完成类方法定义
#include 
  
   
#include 
   
     using namespace std; class Person { static const unsigned LIMIT = 25; string lname; char fname[LIMIT]; public: Person() {lname = ""; fname[0] = '\0'; } // #1 Person(const string & ln, const char * fn = "Heyyou"); // the following methods display lname and fname void Show() const; // firstname lastname format void FormalShow() const; // lastname, firstname format }; Person::Person(const string & ln, const char * fn) { lname = ln; strcpy(fname, fn); } void Person::Show() const { cout << fname << ' ' << lname << endl; } void Person::FormalShow() const { cout << lname << ", " << fname << endl; } int main () { Person one; Person two("Smythecraft"); Person three("Dimwiddy", "Sam"); three.Show(); three.FormalShow(); } 
   
  

10.3编写golf类，包含姓名和成绩两个数据，并实现调用

//10.3编写golf类，包含姓名和成绩两个数据，并实现调用
#include 
  
   
#include 
   
     using namespace std; const int Len = 40; class golf { string fullname; int handicap; public: golf ():fullname("no"),handicap(0) {} golf (const char * name, int hc) { fullname = name; handicap = hc; } void showgolf() { cout << fullname << '\t' << handicap << endl; } }; int main () { golf golfer; golf golfers("tom",100); golfer.showgolf(); golfers.showgolf(); } 
   
  

10.4根据编程练习9.4,用Sales类完成

//10.4根据编程练习9.4,用Sales类完成
#include 
  
   
using namespace std;

class Sales
{
	static const int QUARTERS = 4;
	double sales[QUARTERS];
	double size;
	double average;
	double max;
	double min;
public:	
	Sales (double arr[], int n)
	{
		unsigned	times = n < QUARTERS   (unsigned)n : QUARTERS;
		for (unsigned i = 0; i < times; ++i) 
			sales[i] = arr[i];
		for (unsigned i = times; i < QUARTERS; ++i)
			sales[i] = 0;
		size = times;
		average = calcAverage();
		max = calcMax();
		min = calcMin();
	}
	void setSales()
	{
		cout << "输入" << QUARTERS << "个销售记录：";
		size = QUARTERS;
		for (unsigned i = 0; i < QUARTERS; ++i) {
			cin >> sales[i];
			if (!cin) {
				size = i;
				break;
			}
		}
		for (unsigned i = (unsigned)size; i < QUARTERS; ++i)
			sales[i] = 0;
		cin.clear();
		average = calcAverage();
		max = calcMax();
		min = calcMin();
	}
	double calcAverage () const
	{
		double	sum = 0;
		for (unsigned i = 0; i < size; ++i)
			sum += sales[i];
		return (sum / size);
	}
    double calcMax () const
	{
		unsigned	idxMax = 0;
		for (unsigned i = 0; i < size; ++i)
			if (sales[i] > sales[idxMax])
				idxMax = i;
		return (sales[idxMax]);
	}
	double calcMin () const
	{
		unsigned	idxMin = 0;
		for (unsigned i = 0; i < size; ++i)
			if (sales[i] < sales[idxMin])
				idxMin = i;
		return (sales[idxMin]);
	}

	void showSales () const
	{
		cout << "sales: ";
		for (const auto& e : sales)
			cout << e << ' ';
		cout << endl;
		cout << "average: " << average << endl;
		cout << "max: " << max << endl;
		cout << "min: " << min << endl;
	}
};

int main () 
{     
	double	salesLst[] = {12.2, 11.16, 10.61, 16.24, 11.53};
	Sales salesBook(salesLst, sizeof(salesLst)/sizeof(salesLst[0]));
	salesBook.showSales();
} 
  

10.5编写一个程序，从栈中添加和删除customer结构(包括全名和数量两个成员)，每删除一个结构，把数量计入总数。

//10.5编写一个程序，从栈中添加和删除customer结构(包括全名和数量两个成员)，每删除一个结构，把数量计入总数。
#include 
  
   
using namespace std;

struct customer{  
    char fullname[35];  
    double payment;  
};  
typedef customer Item;  
class Stack{   
    Item items[10];  
    int top;  
public:  
	Stack() :top(0){  }  
	bool isEmpty() const	{  return top==0;	}  
	bool isFull() const  	{  return top==10; }  
	bool push(const Item &item)  
	{  
		if(isFull())  
		{  
			cout<<"Error !Stack is full!"<
   
    //10.6根据以下类编写测试 #include 
    
      #include 
     
       using namespace std; class Move { double m_x; double m_y; public: Move (double a, double b) { m_x = a; m_y = b; } void showMove () const { cout << '(' << m_x << ", " << m_y << ')'; } Move add (const Move& m) const { return (Move(m.m_x + m_x, m.m_y + m_y)); } void reset (double a, double b) { m_x = a; m_y = b; } }; int main () { Move one(12, 4); one.showMove(); cout << endl; Move two(1, 1); one.add(two).showMove(); cout << endl; one.reset(3,4); one.showMove(); cout << endl; } 
     
    
   
  

10.7编写类Plorg和函数实现plorg这些特征：
数据：名称不超过19字符；有满意指数整数CI
操作：新的plorg有名称，CI值50；CI可修改；plorg可报告名称和CI；默认名称为“Plorga”

//10.7编写类Plorg和函数实现plorg这些特征：
//数据：名称不超过19字符；有满意指数整数CI
//操作：新的plorg有名称，CI值50；CI可修改；plorg可报告名称和CI；默认名称为“Plorga”
#include 
  
   
#include 
   
     using namespace std; class Plorg { char _name[20]; unsigned CI; public: Plorg () : CI(50) { strcpy(_name,"Plorga"); } Plorg (const char* name) { CI = 50; strcpy(_name, name); _name[19] = '\0'; } void setCI (unsigned ci) { CI = ci; } void showPlorg () const { cout << _name << ' ' << CI << endl; } }; int main () { Plorg plorg; plorg.showPlorg(); plorg.setCI(12); plorg.showPlorg(); } 
   
  

10.8设计简单列表类：可储存多种类型；可创建空列表；可在列表中添加数据项；可确定列表的空满；可访问每一个项并操作

#include 
  
   
#include 
   
     using namespace std; class TList { public: typedef int Item; public: TList (const Item arr[] = NULL, unsigned n = 0); bool isFull (void) const; bool isEmpty (void) const; bool append (const Item& item); void visit (void (*pf) (Item& item)); private: static const unsigned mk_capacity = 4; private: Item m_content[mk_capacity]; unsigned m_size; }; TList::TList (const Item arr[], unsigned n) { if (NULL == arr) { m_size = 0;