第十章編程練習答案
10.1為復習題5類提供定義，並演示
//10.1為復習題5類提供定義，並演示
#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根據以下類定義和例子，完成類方法定義
//10.2根據以下類定義和例子，完成類方法定義
#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編寫golf類，包含姓名和成績兩個數據，並實現調用
//10.3編寫golf類，包含姓名和成績兩個數據，並實現調用
#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根據編程練習9.4,用Sales類完成
//10.4根據編程練習9.4,用Sales類完成
#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 << "輸入" << QUARTERS << "個銷售記錄：";
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編寫一個程序，從棧中添加和刪除customer結構(包括全名和數量兩個成員)，每刪除一個結構，把數量計入總數。
//10.5編寫一個程序，從棧中添加和刪除customer結構(包括全名和數量兩個成員)，每刪除一個結構，把數量計入總數。
#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根據以下類編寫測試
#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編寫類Plorg和函數實現plorg這些特征：
數據：名稱不超過19字符；有滿意指數整數CI
操作：新的plorg有名稱，CI值50；CI可修改；plorg可報告名稱和CI；默認名稱為“Plorga”
//10.7編寫類Plorg和函數實現plorg這些特征：
//數據：名稱不超過19字符；有滿意指數整數CI
//操作：新的plorg有名稱，CI值50；CI可修改；plorg可報告名稱和CI；默認名稱為“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設計簡單列表類：可儲存多種類型；可創建空列表；可在列表中添加數據項；可確定列表的空滿；可訪問每一個項並操作
#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;
return;
}
m_size = mk_capacity < n ? mk_capacity : n;
for (unsigned i = 0; i < m_size; ++i) {
m_content[i] = arr[i];
}
}
bool
TList::isFull (void) const
{
return (mk_capacity == m_size);
}
bool
TList::isEmpty (void) const
{
return (0 == m_size);
}
bool
TList::append (const Item& item)
{
if (isFull()) {
return (false);
}
m_content[m_size++] = item;
return (true);
}
void
TList::visit (void (*pf) (Item& item))
{
for (unsigned i = 0; i < m_size; ++i) {
pf(m_content[i]);
}
}
static void
show (TList::Item& item)
{
cout << item << ' ';
}
int
main (void)
{
TList one;
one.visit(show);
cout << endl;
cout << "是否空：" << boolalpha << one.isEmpty();
cout << endl << "=========" << endl;
TList::Item arr[] = {1, 2, 3};
TList two(arr, sizeof(arr)/sizeof(arr[0]));
two.visit(show);
cout << endl;
cout << "是否滿：" << two.isFull();
cout << endl;
cout << "是否空：" << two.isEmpty();
cout << endl;
cout << "追加一項：" << two.append(16);
cout << endl;
two.visit(show);
cout << endl;
}
