C++primer plus 第四章编程练习

本人用code::block 编写，如需参考，善用Ctrl+shift+C 和 Ctrl + shift + X 快捷键
如有任何错误或疑问，欢迎留言

        //4.1
//#include <iostream>
//#include <vector>
//#include <string>
//int main()
//{
//    using namespace std;
//    char firstname[20];
//    char lastname[20];
//    int age = 0;
//    char Rank = 0;
//    cout << "What is your first name? ";
//    cin.getline(firstname, 19);
//    cout << "What is your last name? ";
//    cin.get(lastname, 20);
//    cout << "What letter grade dou you deserve? ";
//    cin >> Rank;
//    cout << "What is your age? ";
//    cin >> age;
//    cout << "Name: " << firstname << ", " << lastname << endl;
//    cout << "Grade: " << char(Rank + 1) << endl;
//    cout << "Age: " << age << endl;
//    return 0;
//}
        //4.2
//#include <iostream>
//#include <string>
//
//int main()
//{
//    using namespace std;
//    const int ArSize(20);
//    string name;
//    string dessert;
//
//    cout << "Enter your name:\n";
//    getline(cin, name); // new usage;
//    cout << "Enter your favorite dessert:\n" ;
//    getline(cin, dessert);
//    cout << "I have some delicious " << dessert;
//    cout << " for you, " << name << endl;
//    return 0;
//}
        //4.3
//#include <iostream>
//#include <cstring>
//int main()
//{
//    using namespace std;
//    char firstname[20];
//    char lastname[20];
//    char name[40];
//    cout << "Enter your first name: ";
//    cin.getline(firstname, 20);
//    cout << "Enter your last name: ";
//    cin.getline(lastname, 20);
//    strncpy(name,firstname,39);
//    strcat(name, ", ");
//    strcat(name, lastname);
//
//    cout << "Here's the information in a single string: " << name;
//
//    return 0;
//}

        //4.4
//#include <iostream>
//#include <string>
//int main()
//{
//    using namespace std;
//    string firstname;
//    string lastname;
//
//    string name;
//    cout << "Enter your first name: ";
//    getline(cin, firstname);
//    cout << "Enter your last name: ";
//    getline(cin, lastname);
//    name = firstname + ", " + lastname;
//
//
//    cout << "Here's the information in a single string: " << name;
//
//    return 0;
//}

        //4.5
//#include <iostream>
//#include <string>
//using namespace std;
//struct CandyBar
//{
//    string brand;
//    double weight;
//    int calories;
//};
//int main()
//{
//
//    CandyBar snack = {"Mocha Munch", 2.3, 50};
//
//    cout << "Here's a kind of snack, its information as follow:\nbrand:  "
//    << snack.brand << endl;
//    cout << "weights: " << snack.weight << endl;
//    cout << "calories: " << snack.calories << endl;
//
//    return 0;
//}
        //4.6
//#include <iostream>
//#include <string>
//using namespace std;
//struct CandyBar
//{
//    string brand;
//    double weight;
//    int calories;
//};
//int main()
//{
//
//    CandyBar snacks[3];
//    int i = 0;
//    for (; i<3; i++)
//    {
//        cout << "Enter the information of the snacks " << i+1 << endl;
//        getline(cin, (snacks+i)->brand);
//
//        (cin >> (snacks+i)->weight >> (snacks+i)->calories).get();
//    }
//    cout << endl << "Here is the information of the three snacks: " << endl << endl;
//
//    for (i=0; i<3; i++)
//    {
//    cout << "snacks " << i+1 << ": ";
//    cout << "brand: "<< snacks[i].brand << endl;
//    cout << "weights: " << snacks[i].weight << endl;
//    cout << "calories: " << snacks[i].calories << endl;
//    }
//    return 0;
//}
        //4.7
//#include <iostream>
//#include <string>
//using namespace std;
//struct Pizza
//{
//  string company;
//  double diameter;
//  double weight;
//};
//int main()
//{
//    Pizza lili;
//    cout << "Enter yout pizzza's name, diameter, weight:" << endl;
//    getline(cin, lili.company);
//    cin >> lili.diameter >> lili.weight;
//    cout << "Thie is your pizza's information: " << endl;
//    cout << "name: " << lili.company << endl;
//    cout << "diameter: " << lili.diameter << endl;
//    cout << "weight: " << lili.weight << endl;
//    return 0;
//}

        //4.8
//#include <iostream>
//#include <string>
//using namespace std;
//struct Pizza
//{
//  string company;
//  double diameter;
//  double weight;
//};
//int main()
//{
//    Pizza* lili = new Pizza;
//    cout << "Enter yout pizzza's diameter, weight, name:" << endl;
//    (cin >> lili->diameter >> lili->weight).get();
//    getline(cin, lili->company);
//    cout << "Thie is your pizza's information: " << endl;
//    cout << "name: " << lili->company << endl;
//    cout << "diameter: " << lili->diameter << endl;
//    cout << "weight: " << lili->weight << endl;
//    return 0;
//}

        //4.9
//#include <iostream>
//#include <string>
//using namespace std;
//struct CandyBar
//{
//    string brand;
//    double weight;
//    int calories;
//};
//int main()
//{
//
//    CandyBar* snacks = new CandyBar[3];
//    int i = 0;
//    for (; i<3; i++)
//    {
//        cout << "Enter the information of the snacks " << i+1 << endl;
//        getline(cin, (snacks+i)->brand);
//
//        (cin >> (snacks+i)->weight >> (snacks+i)->calories).get();
//    }
//    cout << endl << "Here is the information of the three snacks: " << endl << endl;
//
//    for (i=0; i<3; i++)
//    {
//    cout << "snacks " << i+1 << ": ";
//    cout << "brand: "<< snacks[i].brand << endl;
//    cout << "weights: " << snacks[i].weight << endl;
//    cout << "calories: " << snacks[i].calories << endl;
//    }
//    return 0;
//}
        //4.10
#include <iostream>
#include <array>
using namespace std;
int main()
{
    array<double, 3> score;
    int i = 0;
    cout << "Enter your scores in 40 yards rushing:" << endl;
    for (; i<3; i++)
    {
        cout << "score " << i+1 << ":" << endl;
        cin >> score[i];
    }
    double ave = 0.0;
    ave = (score[0]+score[1]+score[2])/i;
    cout << "You have run " << i << " times" << endl;
    cout << "Your score in average is: " << ave << endl;
    return 0;


}