C ++ Primer Plus (Sixth Edition) Chapter 4 Programming Exercises

Chapter IV composite type programming exercises

Compiler Clion 2019.03.02

//第一题
# include<iostream>
# include<cstring>
using namespace std;
int main()
{
    string firstname = {};
    string lastname = {};
    int age = 0;
    char grade = {};
    cout<<"what is your first name?";
    getline(cin,firstname);//读取从键盘的输入，用getline对象可以输入含有空格的字符串，
    //是读取整行，以换行符为字符串结束的标志。
    cout<<"what is your last name?";
    getline(cin, lastname);
    cout<<"what letter grade do you deserve?";
    cin>>grade;
    cout<<"what is your age?";
    cin>>age;
    cout<<"name:"<<firstname<<","<<lastname<<endl;
    cout<<"Grade:"<<char(grade+1)<<endl;
    cout<<"Age:"<<age<<endl;
    return 0;
}

//第二题
# include<iostream>
# include<string>
int main()
{
    using namespace std;
    const int maxsize = 20;
    string s1;
    string s2;
    cout<<"please input your name:\n";
    getline(cin, s1);
    cout<<"please input your favorite dessert:\n";
    getline(cin, s2);
    cout<<"I have some delicious "<<s2<<" for you "<<s1<<endl;
    return 0;
}

//第三题
# include<iostream>
int main()
{
    using namespace std;
    const int max = 20;
    char first[max];
    char last[max];

    cout<<"enter your first name:";
    cin.getline(first, max);
    cout<<"enter your last name:";
    cin.getline(last, max);
    cout<<"here is the information in a single string: "<< last<<" "<<first<<endl;
    return 0;
}

//第四题
# include<iostream>
# include<cstring>
# include<string>
using namespace std;
int main()
{
    string first ;
    string last ;
    cout<<"please input your first name:";
    getline(cin, first);
    cout<<"please input your last name:";
    getline(cin, last);
    cout<<"here's the information in a single string:"<<last<<", "<<first<<endl;
    return 0;

//第五题
# include<iostream>
# include<string>
using namespace std;
struct candyBar{
    string name;
    double weight;
    int carlorie;
};
int main()
{
    candyBar snack={
            "Mocha Munch",
            2.3,
            350
    };
    cout<<snack.name<<endl;
    cout<<snack.weight<<endl;
    cout<<snack.carlorie<<endl;
    return 0;

}

//或者第五题
# include<iostream>

using namespace std;
struct candyBar{
    char name[20];
    double weight;
    int carlorie;
};
int main()
{
    candyBar snack={
            "Mocha Munch",
            2.3,
            350
    };
    cout<<snack.name<<endl;
    cout<<snack.weight<<endl;
    cout<<snack.carlorie<<endl;
    return 0;

}

//第六题  结构数组
# include<iostream>
# include<string>
using namespace std;
struct candyBar{
    string name;
    double weight;
    int carlorie;
};
int main()
{   //创建一个包含有3个结构元素的candyBar数组
    candyBar arm[3]={
            {"Mocha Munch", 2.3,350},
            {"Dove",70, 2386},
            {"cache",123.6,5380}
    };
    cout<<"candyBar_1: "<<arm[0].name<<","<<arm[0].weight<<","<<arm[0].carlorie<<endl;
    cout<<"candyBAr_2: "<<arm[1].name<<","<<arm[1].weight<<","<<arm[1].carlorie<<endl;
    cout<<"candyBar_3: "<<arm[2].name<<","<<arm[2].weight<<","<<arm[2].carlorie<<endl;
}

//第七题？？？
//创建一个结构，从键盘输入结构的元素
# include<iostream>
# include<cstring>
using namespace std;
struct pizza{
    string name;
    double size;
    int number;
};
int main()
{
    pizza orders[3];
    cout<<"please input the 1st name:"<<endl;
    getline(cin, orders[0].name);
    cout<<"the size:"<<endl;
    cin>>orders[0].size;
    cout<<"the number:"<<endl;
    cin>>orders[0].number;

    cout<<"please input the 2nd name:"<<endl;
    getline(cin, orders[1].name);
    
    cout<<"the size:"<<endl;
    cin>>orders[1].size;
    cout<<"the number:"<<endl;
    cin>>orders[1].number;

    cout<<"please input the 3rd name:"<<endl;
    getline(cin,orders[2].name);
    cout<<"the size:"<<endl;
    cin>>orders[2].size;
    cout<<"the number:"<<endl;
    cin>>orders[2].number;

    cout<<orders[0].name<<","<<orders[0].size<<","<<orders[0].number<<endl;
    cout<<orders[1].name<<","<<orders[1].size<<","<<orders[1].number<<endl;
    cout<<orders[2].name<<","<<orders[2].size<<","<<orders[2].number<<endl;

    return 0;

}

//第八题 用new 为结构分配内存，而不是声明结构变量
# include<iostream>
# include<string>
# include<string>
using namespace std;

struct pizza{
    string name;
    double size;
    int weight;
};
int main()
{
    pizza * point = new pizza;
    cout<<"input the name:";
    getline(cin, point->name);
    cout<<"input the size:";
    cin>>point->size;
    cout<<"input the weight";
    cin>>point->weight;
    cout<<"name:"<<point->name<<endl;
    cout<<"size:"<<point->size<<endl;
    cout<<"weight:"<<point->weight<<endl;
    delete [] point;
    
    return 0;

}

//第九题
# include<iostream>
# include<string>
using namespace std;
struct candyBar{
    string name;
    double weight;
    int carlorie;
};
int main()
{   //用new 创建一个含有三个元素的结构数组
    candyBar * point=new candyBar[3];

            point[0] = {"Mocha Munch", 2.3,350};
            point[1] = {"Dove",70, 2386};
            point[2] = {"cache",123.6,5380};

    cout<<"candyBar_1: "<<point[0].name<<","<<point[0].weight<<","<<point[0].carlorie<<endl;
    cout<<"candyBAr_2: "<<point[1].name<<","<<point[1].weight<<","<<point[1].carlorie<<endl;
    cout<<"candyBar_3: "<<point[2].name<<","<<point[2].weight<<","<<point[2].carlorie<<endl;

    delete [] point;
    return 0;
}

//第十题 用array对象存储数据
# include<iostream>

# include<array>
int main()
{
    using namespace std;
    array<double, 3> a1;
    cout<<"please input the first :";
    cin>>a1[0];
    cout<<"please input the second :";
    cin>>a1[1];
    cout<<"please input the third :";
    cin>>a1[2];

    cout<<"1 "<<a1[0]<<endl;
    cout<<"2 "<<a1[1]<<endl;
    cout<<"3 "<<a1[2]<<endl;

    return 0;
}