【学习C++】C++ Primer Plus （第六版）第十章编程练习1-8

1.

#include <iostream>#include <string>class Account{private:std::string name;std::string number;double deposit;public:Account(const std::string & na="no name",const std::string & nu="0",int de=0);void show();void add(double dep);void remove(double dep);};Account::Account(const std::string & na, const std::string & nu, int de){name = na;number = nu;deposit =de;}void Account::show(){std::cout << "name: " << name << "   number: " << number << "    deposit: " << deposit << std::endl;}void Account::add(double dep){if (dep <= 0)std::cout << "deposit added can not be negative.\n";elsedeposit += dep;}void Account::remove(double dep){if (dep < 0)std::cout << "deposit removed can not be negative.\n";else if (dep > deposit)std::cout << "you can not remove more than you have!\n";elsedeposit -= dep;}int main(){ Account a;a.show();a = Account("xiaoming", "000111", 0);a.show();a.add(500);a.show();a.remove(400);a.show();Account b("xiaohua", "111000", 5000);b.show();b.add(300);b.show();b.remove(200);b.show();std::cin.get();return 0;}

2.

#include <iostream>#include <string>class Person{private:static const int LIMIT = 25;std::string lname;char fname[LIMIT];public:Person(){ lname = ""; fname[0] = '\0'; }Person(const std::string & ln, const char * fn = "Heyyou");void show() const;void FormalShow() const;};Person::Person(const std::string & ln, const char * fn){lname = ln;strcpy(fname, fn);}void Person::show() const{std::cout << fname << " " << lname;}void Person::FormalShow() const{std::cout << lname << ", " << fname << std::endl;}int main(){ Person one;Person two("Smythecraft");Person three("Dimwiddy", "Sam");three.show();std::cout << std::endl;three.FormalShow();std::cin.get();return 0;}

3.

//golf.h#ifndef GOLF_H_#define GOLF_H_class golf{private:static const int LEN = 40;char fullname[LEN];int handicap;public:golf(const char * name="no name", int hc=0); void setgolf();void handi(int hc);void showgolf();};#endif

//golf.cpp#include <iostream>#include "golf.h"golf::golf(const char * name,int hc){strcpy(fullname, name);handicap = hc;}void golf::setgolf(){char name[LEN];int handi;std::cout << "please input name hand handicap:\n";std::cin.getline(name, LEN);std::cin >> handi;std::cin.get();*this = golf(name, handi);}void golf::handi(int hc){handicap = hc;}void golf::showgolf(){std::cout << fullname << ": " << handicap<<std::endl;}

//main.cpp#include <iostream>#include "golf.h"int main(){ golf a[4];for (int i = 0; i < 4; i++){a[i].showgolf();}for (int i = 0; i < 4; i++){a[i].setgolf();}for (int i = 0; i < 4; i++){a[i].showgolf();}std::cin.get();return 0;}

4.

//sales.h#ifndef SALES_H_#define SALES_H_namespace SALES{class Sales{private:static const int QUARTERS = 4;double sales[QUARTERS];double average;double max;double min;public:Sales(const double ar [], int n);void setSales();void showSales();};}#endif

<pre name="code" class="cpp">//sales.cpp#include <iostream>#include "sales.h"namespace SALES{Sales::Sales(const double ar [], int n){int l;l = n > 4 ? 4 : n;for (int i =0; i < l; i++){sales[i] = ar[i];}if (l < 4)for (int i = l; i < 4; i++)sales[i] = 0;double sum = sales[0];double ma = sales[0], mi = sales[0];for (int i = 1; i < 4; i++){sum += sales[i];ma = ma>sales[i] ? ma : sales[i];mi = mi < sales[i] ? mi : sales[i];}average = sum / 4;max = ma;min = mi;}void Sales::setSales(){double ar[4];std::cout << "please enter 4 numbers: \n";for (int i = 0; i < 4; i++)std::cin >> ar[i];*this = Sales(ar, 4);}void Sales::showSales(){for (int i = 0; i < 4; i++)std::cout << sales[i] << " ";std::cout << std::endl;std::cout << "average: " << average << std::endl;std::cout << "max number: " <<max << std::endl;std::cout << "min number: " << min << std::endl;}}

//main.cpp#include <iostream>#include "sales.h"int main(){ double ar[4] = {0.0, 1.0, 2.0, 3.0 };SALES::Sales s(ar, 4);s.showSales();s.setSales();s.showSales();std::cin.get();std::cin.get();return 0;}

5.

//stack.h#ifndef STACK_H_#define STACK_H_struct customer{char fullname[35];double payment;};typedef customer Item;class Stack{private:enum{ MAX = 10 };Item items[MAX];int top;public:Stack();bool isempty() const;bool isfull() const;bool push(const Item & item);bool pop(Item & item);};#endif

//stack.cpp#include <iostream>#include "stack.h"Stack::Stack(){top = 0;}bool Stack::isempty() const{return top == 0;}bool Stack::isfull() const{return top == MAX;}bool Stack::push(const Item & item){if (top < MAX){items[top++] = item;return true;}elsereturn false;}bool Stack::pop(Item & item){if (top > 0){item = items[--top];return true;}elsereturn false;}

//main.cpp#include <iostream>#include "stack.h"int main(){ Stack s;double sum = 0;customer c[3] = { { "liujiayu", 35 }, { "wagnrunze", 23 }, { "wanghaojian", 10 } };for (int i = 0; i < 3; i++)s.push(c[i]);for (int i = 0; i < 3; i++){s.pop(c[i]);sum += c[i].payment;std::cout << "sum: " << sum << std::endl;}std::cin.get();return 0;}

6.

#include <iostream>class Move{private:double x;double y;public:Move(double a = 0, double b = 0);void showmove() const;Move add(const Move & m) const;void reset(double a = 0, double b = 0);};Move::Move(double a, double b){x = a;y = b;}void Move::showmove() const{std::cout << "x: " << x << "   y: " << y<<std::endl;}Move Move::add(const Move & m) const{Move M;M.x = x + m.x;M.y = y + m.y;return M;}void Move::reset(double a, double b){x = a;y = b;}int main(){ Move a(2,3);a.showmove();Move b(4, 5);b.showmove();Move c;c.showmove();c= a.add(b);c.showmove();a.reset(3, 7);a.showmove();a.reset();a.showmove();std::cin.get();return 0;}

7.

#include <iostream>class Plorg{private:char fullname[20];int CI;public:Plorg(const char * name = "Plorga");void setCI(int c);void showPlorg();};Plorg::Plorg(const char *name){strcpy(fullname, name);CI = 50;}void Plorg::setCI(int c){CI = c;}void Plorg::showPlorg(){std::cout << "name: " << fullname << "   CI: " << CI << std::endl;}int main(){ Plorg p;p.showPlorg();p = Plorg("liujiayu");p.showPlorg();p.setCI(70);p.showPlorg();std::cin.get();return 0;}

8.

//list.h#ifndef LIST_H_#define LIST_H_typedef unsigned int Item;class List{private:enum{ MAX = 10 };Item items[MAX];int num;public:List();void add(const Item &);bool isempty() const;bool isfull() const;void visit(void(*pf)(Item &));};#endif

//list.cpp#include <iostream>#include "list.h"List::List(){num = 0;}void List::add(const Item & a){if (num < MAX){items[num++] = a;}elsestd::cout << "The list is full\n";}bool List::isempty()const{return num == 0;}bool List::isfull() const{return num == MAX;}void List::visit(void(*pf)(Item &)){for (int i = 0; i < num; i++)pf(items[i]);}

//main.cpp#include <iostream>#include "list.h"void show(Item &);int main(){ List l;int i = 0;while (!l.isfull()){l.add(i*10);i++;}l.visit(show);std::cin.get();return 0;}void show(Item &a){std::cout << a <<std::endl;}