C++ Primer第八章课后编程题

标签：c++   c++ prime   c++初学   引用传参   模版   

#include<iostream>
using namespace std;
void show(const char * a, int b=0);
void show(const char * a, int b)
{
    static int uses = 0;
    int lim = ++uses;
    cout << "第" << uses << "次调用.\n";
    if(b==0)
        lim = 1;
    for (int i=0; i<lim; i++)
        cout <<a<<endl;
}
int main()
{
    int i;
    const char * p = "hello world\n";
    cout <<"输入函数调用次数:";
    cin >> i;
    while(i>=0)
    {
        cout << "参数n为:" <<i;
        show(p, i);
        i--;
    }
    cout << "默认n为0:";
    show(p);
    return 0;
}    

#include<iostream>
#include<cstring>
using namespace std;
const int MAX=60;
struct CandyBar{
    char brand[MAX];
    double weight;
    int energy;
};
void init(
    CandyBar & cb,
    const char *br = "Millennium Munch",
    double we = 2.85,
    int ca = 350
);
void display(const CandyBar & cb);
int main()
{
    CandyBar candybar;
    cout << "默认的candybar为："<<endl;
    init(candybar);
    display(candybar);
    char newBrand[MAX];
    double newWeight;
    int newEnergy;
    cout << "请输入新的candybar数据:"<<endl;
    cout << "brand: ";
    cin.get(newBrand, MAX);
    cout << "weight: ";
    cin >> newWeight;
    cout << "Energy: ";
    cin >> newEnergy;
    init(candybar, newBrand, newWeight, newEnergy);
    display(candybar);
    return 0;
}
void init(CandyBar &cb,const char *br, double we, int ca)
{
    strcpy(cb.brand, br);
    cb.weight = we;
    cb.energy = ca;
}
void display(const CandyBar &cb)
{
    cout << "新的candybar为：\n";
    cout << "brand: " << cb.brand<<endl;
    cout << "weight: "<<cb.weight<<endl;
    cout << "energy: "<<cb.energy<<endl;
}

enter a string (q to quit) :go away
GO AWAY
next string (q to quit) : good grief !
GOOD GRIEF!
next string (q to quit) : q
bye.

#include<iostream>
#include<string>
using namespace std;
void wordupper(string &a);
int main()
{
    string str;
    cout << "Enter a string (1 to quit):";
    getline(cin, str);
    int i=0;
    while (str != "q")
    {
        wordupper(str);
        cout << str <<endl;
        cout << "next string (q to quit):";
        getline(cin, str);
    }
    cout << "bey!\n";
    return 0;
}
void wordupper(string &a)
{
    int i;
    while (a[i])
    {
        a[i] = toupper(a[i]);
        i++;
    }
}

#include<iostream>
template<class T>
T max5(T ar[])
{
    int n;
    T max = ar[0];
    for (n=1; n<5; n++)
        if (ar[n] > max)
            max = ar[n];
    return max;
}
const int lim = 5;
int main()
{
    using namespace std;
    double ard[lim] = {-3.1, 8.1, -71.1, 34.4, 2.3};
    int ari[lim] = {2, 3, 10, 9, 7};
    double md;
    int mi;
    md = max5(ard);
    mi = max5(ari);
    cout << "Max double = " << md <<endl;
    cout << "Max int = " << mi <<endl;
    return 0;
}

#include<iostream>
#include<cstring>
template<class T>
T maxn(T ar[], int n)
{
    int i;
    T max = ar[0];
    for (i=1; i<n; i++)
        if(ar[i] > max)
            max = ar[i];
    return max;
}
template<> const char * maxn(const char * arr[], int n)
{
    const char * max = arr[0];
    int i;
    for (i=1; i<n; i++)
        if(strlen(arr[i]) > strlen(max))
            max = arr[i];
    return max;
}
int main()
{
    using namespace std;
    int ari[6] = {8,4,2,7,10,22};
    double ard[4] = {-3.1, 8.1, -71.1, 34.4};
    const char * char_arr[5] = {
        "hello world!",
        "what your name?",
        "I love you",
        "you are wonderful",
        "hi"
    };
    cout << "The max integer of array is:" << maxn(ari, 6) <<endl;
    cout << "The max double of array is:" << maxn(ard, 4) <<endl;
    cout << "The max string of array is:" << maxn(char_arr, 5) <<endl;
    return 0;
}

#include <iostream>
template <typename T>
T ShowArray (T arr[], int n);
template <typename T>
T ShowArray (T * arr[], int n);
struct debts
{
   char name[50];
   double amount;
};
int main(void)
{
   using namespace std;
   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 counts of things:\n";
   cout << ShowArray(things,6) <<endl;
   cout<<"Listing Mr. E's debts:\n";
   cout << ShowArray(pd,3) <<endl;
   return 0;
}
template <typename T>
T ShowArray (T arr[],int n)
{
   using namespace std;
   T total = 0;
   cout<<"template A\n";
   for (int i = 0; i < n; i++)
      total +=arr[i];
   return total;
}
template <typename T>
T ShowArray (T * arr[], int n)
{
   using namespace std;
   T total = 0;
   cout<< "template B\n";
   for (int i = 0; i < n; i++)
      total += *arr[i];
   return total;
}

C++ Primer第八章课后编程题

标签：c++   c++ prime   c++初学   引用传参   模版   

原文地址：http://blog.csdn.net/guugle2010/article/details/40788687