C++ Primer Plus (第6版)编程练习 代码-----第八章

1.太笨了，真的没有看懂这个练习题

8.2

#include "stdafx.h"#include<iostream>#include <string>#include<cctype>using namespace std;struct CandyBar{char *name;float weight;int cal;};void display(CandyBar &cb,char *name="Millennium Munch",float weight=2.85,int cal=350);int _tmain(int argc, _TCHAR* argv[]){CandyBar bar,bar1;display(bar,"sugarsugar", 20.3,800);display(bar1);system("pause");return 0;}void display(CandyBar &cb,char *name,float weight,int cal){cb.name=name;cb.weight=weight;cb.cal=cal;cout<<"name:"<<cb.name<<endl;cout<<"weight:"<<cb.weight<<endl;cout<<"calories:"<<cb.cal<<endl;}

</pre><pre name="code" class="cpp">//8.3void change(string &str);int _tmain(int argc, _TCHAR* argv[]){string in;cout<<"Enter a string (q to quit): ";getline(cin,in);while(in!="q\0"){change(in);   cout<<in<<endl<<"Next string(q to quit): ";   getline(cin,in);}cout<<"Bye.";system("pause");return 0;}void change(string &str){int n=str.length();for(int i=0;i<n;i++){str[i]=toupper(str[i]);}}

8.4

struct stringy{    char * str;int ct;};void set(stringy &s,char ch[]);void show(const stringy &s ,int n=1);void show(const char ch[] ,int n=1);int _tmain(int argc, _TCHAR* argv[]){stringy beany;char testing[]= "Reality isn't what is used to be.";set(beany,testing);show(beany);show(beany,2);testing[0]='D';testing[1]='u';show(testing);show(testing,3);show("Done!");system("pause");return 0;}void set(stringy &s,char ch[]){s.str=ch;s.ct=strlen(s.str);}void show(const stringy &s ,int n){for(int i=0;i<n;i++){cout<<s.str<<endl;cout<<s.ct<<endl<<endl;}}void show(const char ch[] ,int n){   for(int i=0;i<n;i++){cout<<ch<<endl<<endl;}}

8.5

template<typename T>void max5(T s[]);int _tmain(int argc, _TCHAR* argv[]){int t1[5]={1,2,4,5,3};double t2[5]={2.01,1.0567,3.05678,4.02345,5.12340};max5(t1);max5(t2);system("pause");return 0;}template<typename T>void max5(T s[]){T a=s[0];for(int i=0;i<5;i++){cout<<i+1<<": "<<s[i]<<endl;if(a<s[i]) a=s[i];}cout<<"The max is :"<<a<<endl<<endl<<endl; }

8.6  

template<typename T>void maxn(T s[],int n);template<>void maxn<char*>(char *st[],int n); int _tmain(int argc, _TCHAR* argv[]){int t1[6]={1,2,4,5,3,0};double t2[4]={2.01,1.0567,3.05678,4.02345};maxn(t1,6);maxn(t2,4);char *s1[5]={"abc","defgh","kl","qwer578ddahg","applepie"};maxn(s1,5);system("pause");return 0;}template<typename T>void maxn(T s[],int n){T a=s[0];for(int i=0;i<n;i++){cout<<i+1<<": "<<s[i]<<endl;if(a<s[i]) a=s[i];}cout<<"The max is :"<<a<<endl<<endl<<endl; }template<>void maxn<char*>(char *st[],int n){    int a=strlen(st[0]);int max=0;for(int i=0;i<n;i++){cout<<i+1<<": "<<st[i]<<endl;int b=strlen(st[i]);if(a<b){  a=b;  max=i;}}cout<<"The max is :"<<st[max]<<" has "<<a<<" character."<<endl<<endl<<endl;}

8.7

//例子中的函数没有改动template<typename T>void ShowArray(T arr[],int n);template<typename T>void ShowArray(T *arr[],int n);template<typename T>void SumArray(T arr[],int n);template<typename T>void SumArray(T *arr[],int n);struct debts{   char name[50];   double amount;};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].amount;cout<<"Listing Mr.E's count of things:\n";ShowArray(things,6);SumArray(things,6);cout<<"Listing Mr.E's debts:\n";ShowArray(pd,3);SumArray(pd,3);system("pause");return 0;}template <typename T >void ShowArray(T arr[],int n){cout<<"template A \n";for(int i=0;i<n;i++)  cout<<arr[i]<<" "; cout<<endl;}template <typename T >void ShowArray(T *arr[],int n){  cout<<"template B \n";for(int i=0;i<n;i++)  cout<<*arr[i]<<" "; cout<<endl;}template <typename T >void SumArray(T arr[],int n){cout<<"The sum of things is :";    int sum=0;for(int i=0;i<n;i++)  sum=sum+arr[i]; cout<<sum<<endl;}template <typename T >void SumArray(T *arr[],int n){  cout<<"The sum of debt is :";    double sum=0.0;for(int i=0;i<n;i++)  sum=sum+*arr[i]; cout<<sum<<endl;}