#include<iostream>
#include<climits>
#include<string>
#include<cstring>
#include<array>

using namespace std;

struct CandyBar {
    string brand;
    double weight;
    int carl;
};

struct Pizza {
    string companyName;
    float diameter;
    float weight;
};

int main() {
    //第四章编程练习4.1
    /*char firstName[20];
    char lastName[20];
    char grade;
    int age;
    cout << "what is your first name?";
    cin.getline(firstName, 20);
    cout << "what is your last name?";
    cin.getline(lastName, 20);
    cout << "what letter grade do you deserve?";
    cin >> grade;
    cout << "what is your age?";
    cin >> age;
    cout << "name:" << firstName << "," << lastName << endl;
    cout << "grade:" << grade << endl;
    cout << "age:" << age << endl;*/


    //4.2
    /*string name;
    string dessert;
    cout << "enter your name:\n";
    getline(cin, name);
    cout << "enter your favorite dessert:\n";
    getline(cin, dessert);
    cout << "I have delicious " << dessert << " for you, " << name << endl;*/

    //4.3
    /*char firstName[20];
    char lastName[20];
    cout << "Enter your first name:";
    cin.getline(firstName, 20);
    cout << "Enter your last name:";
    cin.getline(lastName, 20);
    char name[40];
    strcpy_s(name, lastName);
    strcat_s(lastName, ",");
    strcat_s(lastName, firstName);
    cout << "here some information in a single string:" << lastName << endl;*/

    //4.4
    /*string firstname;
    string lastname;
    string name;
    cout << "Enter your first name:";
    getline(cin, firstname);
    cout << "Enter your last name:";
    getline(cin,lastname);
    name = lastname + "," + firstname;
    cout << "here some information in a single string:" << name << endl;*/

    //4.5
    /*CandyBar snack{ "Mocha Munch",2.3,350 };
    cout << "snack's brand is:" << snack.brand << endl;
    cout << "snack's weight is:" << snack.weight << endl;
    cout << "snack's carl is:" << snack.carl << endl;*/

    //4.6
    //CandyBar candy[3] = { { "Mocha Munch",2.3,350 },{ "Mocha",1.3,150 } ,{ "DEFU",2,300 } };

    //4.7
    /*Pizza p;
    cout << "Enter pizza's company name:";
    getline(cin, p.companyName);
    cout << "Enter pizza's diameter:";
    cin >> p.diameter;
    cout << "Enter pizza's weight:";
    cin >> p.weight;
    cout << "This pizza's information is:\n";
    cout << "Company name = " << p.companyName << endl;
    cout << "diameter = " << p.diameter << endl;
    cout << "weight= " << p.weight << endl;*/

    //4.8
    /*Pizza *p = new Pizza;
    cout << "Enter pizza's company name:";
    getline(cin, p->companyName);
    cout << "Enter pizza's diameter:";
    cin >> p->diameter;
    cout << "Enter pizza's weight:";
    cin >> p->weight;

    cout << "This pizza's information is:\n";
    cout << "Company name = " << p->companyName << endl;
    cout << "diameter = " << p->diameter << endl;
    cout << "weight= " << p->weight << endl;
    delete p;*/

    //4.9
    /*CandyBar *cand = new CandyBar[3];
    cand[0] = { "Mocha Munch",2.3,350 };
    cand[1] = { "Mocha",1.3,150 };
    cand[2] = { "DEFU",2,300 };
    cout << "cand[0]'s brand is " << cand[0].brand << endl;
    cout << "cand[0]'s weight is " << cand[0].weight << endl;
    cout << "cand[0]'s carl is " << cand[0].carl << endl;
    cout << "cand[1]'s brand is " << cand[1].brand << endl;
    cout << "cand[1]'s weight is " << cand[1].weight << endl;
    cout << "cand[1]'s carl is " << cand[1].carl << endl;
    cout << "cand[2]'s brand is " << cand[2].brand << endl;
    cout << "cand[2]'s weight is " << cand[2].weight << endl;
    cout << "cand[2]'s carl is " << cand[2].carl << endl;
    delete[] cand;*/

    //4.10
    array<double, 3> grade;
    cin >> grade[0];
    cin >> grade[1];
    cin >> grade[2];
    double aver = (grade[0] + grade[1] + grade[2]) / 3.0;
    cout << "The average grade is " << aver << endl;
    return 0;
}