C++ Prime Plus 第六版 第四章 复合类型 编程练习 参考答案 详细版

以下答案本人在linux vscode中均已亲自测试编译通过，完美运行．

４.１

#include
using namespace std;
int main()
{
    const int size = 30;
    char name1[size]={0}; 
    char name2[size]={0};
    char grade;
    int Age;
    cout << "what is your first name ? ";
    cin.getline(name1,size);
    cout << "what is your last name ? ";
    cin.getline(name2,size);
    cout << "what letter grade do you deserve ? ";
    cin >> grade;
    cout << "what is your Age ? ";
    cin >> Age;
    cout << "name：" << name1 << ',' << name2 << endl;
    cout << "grade：" << grade << endl;
    cout << "Age：" << Age << endl;
}

４.２

#include
#include
using namespace std;
int main()
{
    string name;
    string dessert;
    cout << "Ｅnter your name :\n ";
    getline(cin,name);
    cout << "Ｅnter your favorite dessert :\n";
    getline(cin,dessert);
    cout << "I have some delicious " << dessert << " for you," << name << " .\n";
    return 0;
}

４.３

#include
#include
using namespace std;
int main()
{
    const int size = 30;
    char name1[size]={0}; 
    char name2[size]={0};
    cout << "what is your first name ? ";
    cin >> name1;
    cout << "what is your last name ? ";
    cin >> name2;
    cout << "here's the information in a single：" << name1 << ", " << name2 << endl;
}

４.４

#include
#include
using namespace std;
int main()
{
    string name1, name2;
    cout << "what is your first name ? ";
    cin >> name1;
    cout << "what is your last name ? ";
    cin >> name2;
    cout << "here's the information in a single：" << name1 << ", " << name2 << endl;
}

４.５

#include
#include
using namespace std;
struct CandyBar
{
    string name;   //品牌
    double weight; //重量
    int calorie;   //卡路里
};
int main()
{
    CandyBar snack{"Mocha Munch",2.3,350};
    cout << "name：" << snack.name << endl;
    cout << "weight：" << snack.weight << endl;
    cout << "calorice：" << snack.calorie << endl;
}

４.６

#include
#include
using namespace std;
struct CandyBar
{
    string name;   //品牌
    double weight; //重量
    int calorie;   //卡路里
};
int main()
{
    int i;
    CandyBar snack[3]{{"Mocha Munch",2.3,350},{"Wujia sweet",2.8,280},{"lijia beautiful",3.0,190}};
    for(i=0;i<3;i++)
    {   
        cout << "name：" << snack[i].name << endl;
        cout << "weight：" << snack[i].weight << endl;
        cout << "calorice：" << snack[i].calorie << endl;
    }
}

４.７

#include
#include
using namespace std;
struct CandyBar
{
    string name;     //披萨饼公司名称
    double diameter; //披萨饼直径
    double weight;   //披萨饼重量
};
int main()
{
    CandyBar pizza;
    cout << "Please enter the brand of pizza company：";
    getline(cin,pizza.name);
    cout << "Please enter the diameter of the pizza：";
    cin >> pizza.diameter;
    cout << "Please enter the pizza weight：";
    cin >> pizza.weight;
    cout << "the brand of pizza company：" << pizza.name << endl;
    cout << "the diameter of the pizza：" << pizza.diameter << endl;
    cout << "the pizza weight：" << pizza.weight << endl;
}

４.８

#include
#include
using namespace std;
struct CandyBar
{
    string name;     //披萨饼公司名称
    double diameter; //披萨饼直径
    double weight;   //披萨饼重量
};
int main()
{
    CandyBar * pizza = new CandyBar;
    cout << "Please enter the diameter of the pizza：";
    cin >> pizza->diameter;
    cout << "Please enter the brand of pizza company：";
    cin.get();   //由于上一次输入结束后，录入一个换行符，导致下条语句判断为输入结束，直接输出结果，本条语句用来接收那个换行符
    getline(cin,pizza->name);
    cout << "Please enter the pizza weight：";
    cin >> pizza->weight;
    cout << "the brand of pizza company：" << pizza->name << endl;
    cout << "the diameter of the pizza：" << pizza->diameter << endl;
    cout << "the pizza weight：" << pizza->weight << endl;
}

４.９

#include
#include
using namespace std;
struct CandyBar
{
    string name;   //品牌
    double weight; //重量
    int calorie;   //卡路里
};
int main()
{
    int i;
    CandyBar * snack = new CandyBar [3]{{"Mocha Munch",2.3,350},{"Wujia sweet",2.8,280},{"lijia beautiful",3.0,190}};
    for(i=0;i<3;i++)
    {   
        cout << "name：" << snack[i].name << endl;
        cout << "weight：" << snack[i].weight << endl;
        cout << "calorice：" << snack[i].calorie << endl;
    }
    delete [] snack;
}

４.１０

#include
#include
using namespace std;
int main()
{
    int i;
    double ave = 0.0,sum = 0.0;
    array score;
    for(i=0;i<3;i++)
    {   
        cout << "Please enter the result of the 40-meter race：";
        cin >> score[i];
        sum += score[i];
    }
    ave = sum / 3;
    for(i=0;i<3;i++)   
        cout << "第 " << i+1 <<" 次40米跑成绩：" << score[i] << endl;
    cout << i <<" 次40米跑的平均成绩是：" << ave << endl;
}