C++ primer plus 第八章编程练习

1、

/********************************************************************************************Author:Tang QingyunTime:2017/03/09From:C++ primer plus 第八章编程练习 第1题*********************************************************************************************/#include "stdafx.h"#include<iostream>#include<string>using namespace std;void print(const char *str, int n=0);int main(){const char * str="well,well,well";cout << "++++++++++++++++++++++++\n";print(str);cout << "++++++++++++++++++++++++\n";print(str, 3);return 0;}void print(const char *str, int n){if (n <= 0)n = 1;for (int i = 0; i < n;i++)cout << str<<endl;}

2、

/********************************************************************************************Author:Tang QingyunTime:2017/03/09From:C++ primer plus 第八章编程练习 第2题*********************************************************************************************/#include "stdafx.h"#include<iostream>using namespace std;struct CandyBar{char Name[20];double Weight;int Calories;};void fill(CandyBar &a,const char * N = "Millennium", const double W = 2.85,const int C = 350);void show(const CandyBar &b);int main(){CandyBar s,z;fill(s);show(s);char name[30];double weight;int calories;cout << "Please enter the name:";cin.getline(name, 30);cout << "Please enter the weight:";cin >> weight;cout << "Please enter the calories:";cin >> calories;fill(z, name, weight, calories);show(z);return 0;}void fill(CandyBar &a, const char* N, const double W,const int C){strcpy_s(a.Name , N);a.Weight = W;a.Calories = C;}void show(const CandyBar &b){cout << "Name:" << b.Name << endl;cout << "Weight:" << b.Weight << endl;cout << "Calories:" << b.Calories << endl;}

3、

/********************************************************************************************Author:Tang QingyunTime:2017/03/09From:C++ primer plus 第八章编程练习 第3题*********************************************************************************************/#include "stdafx.h"#include<iostream>#include<string>#include<cctype>using namespace std;void transform(string &str);int main(){cout << "Enter a string (q to quit):";string s;getline(cin, s);while (s != "q"){transform(s);cout << s << endl;cout << "Next string (q to quit):";getline(cin, s);}cout << "Bye." << endl;return 0;}void transform(string &str){for (int i = 0; i < str.size(); i++)str[i] = toupper(str[i]);}

4、

/********************************************************************************************Author:Tang QingyunTime:2017/03/09From:C++ primer plus 第八章编程练习 第4题*********************************************************************************************/#include "stdafx.h"#include<iostream>#include<string>using namespace std;struct stringy{char *str;int ct;};void set(stringy &s, const char *str);void show(const stringy&s, int n=1);void show(char *str, int n=1);int main(){stringy beany;char testing[] = "Reality isn't what it used to be.";set(beany, testing);show(beany);show(beany, 2);testing[0] = 'D';testing[1] = 'u';show(testing);show(testing, 3);show("Done!");return 0;}void set(stringy &s, const char *str){int len = strlen(str);s.ct = len;s.str = new char(len + 1);strcpy_s(s.str,(len+1), str);}void show(const stringy&s,int n){for (int i = 0; i < n; i++)cout << s.str<<endl;}void show(char *str, int n){for (int i = 0; i < n; i++)cout << str << endl;}

5、

/********************************************************************************************Author:Tang QingyunTime:2017/03/09From:C++ primer plus 第八章编程练习 第6题*********************************************************************************************/#include "stdafx.h"#include<iostream>//#include<string>using namespace std;template<typename T>T max5(T z[]);int main(){int a[5] = { 1, 3, 6, 2, 5 };double b[5] = { 2.4, 5.1, 1.6, 3.3, 9.1 };int amax;double bmax;amax = max5(a);cout << "amax=" << amax << endl;bmax = max5(b);cout << "bmax=" << bmax << endl;return 0;}template<typename T>T max5(T z[]){T temp;temp = z[0];for (int i = 1; i < 5; i++){if (temp <= z[i])temp = z[i];}return temp;}

6、

/********************************************************************************************Author:Tang QingyunTime:2017/03/09From:C++ primer plus 第八章编程练习 第6题*********************************************************************************************/#include "stdafx.h"#include<iostream>//#include<string>using namespace std;template<typename T>T maxn(T z[],int n);template<>char* maxn(char * a[], int n);int main(){int a[6] = { 1, 3, 6, 2, 5,2 };double b[4] = { 5.1, 1.6, 3.3, 9.1 };char *c[5] = { "sss", "s", "sssssssss", "ss", "ssss" };cout << "amax=" << maxn(a, 6) << endl;cout << "bmax=" << maxn(b, 4) << endl;cout << "clongest=" << maxn(c, 5) << endl;return 0;}template<typename T>T maxn(T z[],int n){T temp;temp = z[0];for (int i = 1; i < n; i++){if (temp <= z[i])temp = z[i];}return temp;}template<>char* maxn(char * a[], int n){char * temp = a[0];for (int i = 0; i < n; i++){if (strlen(temp) < strlen(a[i]))temp=a[i];}return temp;}

7、

/********************************************************************************************Author:Tang QingyunTime:2017/03/09From:C++ primer plus 第八章编程练习 第7题*********************************************************************************************/#include "stdafx.h"#include<iostream>using namespace std;template<typename T>T SumArray(T arr[], int n);template<typename T>T SumArray(T * arr[], int n);struct debts{char name[50];double amout;};int main(){int things[6] = { 13, 31, 103, 301, 310, 130 };struct debts mr_E[3] ={{ "Ima Wolfe", 2400.0 },{ "Ura Foxe", 1300.0 },{ "Iby Stout", 1800.0 }};double * pd[3];for (int i = 0; i < 3; i++)pd[i] = &mr_E[i].amout;cout << "Sum of Mr.E's counts of things:\n" << SumArray(things, 6) << endl;cout << "Sum of Mr.E's debts:\n" << SumArray(pd, 3) << endl;return 0;}template<typename T>T SumArray(T arr[], int n){cout << "template A\n";T sum = 0;for (int i = 0; i < n; i++){sum += arr[i];}return sum;}template<typename T>T SumArray(T * arr[], int n){T sum = 0;cout << "template B\n";for (int i = 0; i < n; i++){sum += *arr[i];}return sum;}