1.编写一个 c++ 程序，如下述输出示例所示的那样请求并显示信息 :
What is your first name? Betty Sue
What is your last name? Yewe
What letter grade do you deserve? B
What is your age? 22
Name ： Yewe, Betty Sue
Grade ： C
Age: 22
注意，该程序应该接受的名字包含多个单词。另外，程序将向下调整成绩，即向上调一个字母。假设用户请求A、B或C，所以不必担心D和F之间的空档。
#include<iostream>
using namespace std;
int main()
{
char first_name[20], last_name[20];
char grade;
int age;
cout << "What is your first name? ";
cin.get(first_name, 20).get();
cout << "What is your last name? ";
cin.get(last_name, 20);
cout << "What letter grade do you deserve? ";
cin >> grade;
cout << "What is your age? ";
cin >> age;
cout << "Name: " << last_name << ", " << first_name << endl;
cout << "Grade: " << char (grade + 1) << endl;
cout << "Age: " << age << endl;
while (1);
return 0;
}
2 . 修改程序淸单 4.4, 使用 C+ + string 类而不是 char数组
#include<iostream>
#include<string>
using namespace std;
int main()
{
string name, dessert;
cout << "Enter your name: " << endl;
getline(cin, name);
cout << "Enter your favorite dessert: " << endl;
getline(cin, dessert);
cout << "I have some selicious " << dessert << " for you, " << name << endl;
while (1);
return 0;
}
3 . 编写一个程序，它要求用户首先输入其名，然后输入其姓；然后程序使用一个逗号和空格将姓和名组合起來，并存储和显示组合结果。请使用 char 数组和头文件 cstring 中的函数。下面是该程序运行时的情形：
Enter your first name ： Flip
Enter your last name ： Fleming
Here‘s the information in a single string ：Fleming, Flip
#include<iostream>
using namespace std;
int main()
{
char first_name[20];
char last_name[20];
cout << "Enter your first name: ";
cin.get(first_name, 20);
cout << "Enter your last name: " ;
cin >> last_name;
cout << "Here‘s the information in a single string: " << last_name << ", " << first_name << endl;
while (1);
return 0;
}
4.编写一个程序，它要求用户首先输入其名，再输入其姓；然后程序使用一个逗号和空格将姓和名组合起来，并存储和显示组合结果。请使用string类和头文件string中的函数。下面是程序运行时的情形：
Enter your first name: Flip
Enter your last name: Fleming
Here‘s the information in a single string: Fleming, Flip
#include<iostream>
#include<string>
using namespace std;
int main()
{
string first, last;
cout << "Enter your first name: ";
cin >> first;
cout << "Enter your last name: " ;
cin >> last;
cout << "Here‘s the information in a single string: " << last << ", " << first << endl;
while (1);
return 0;
}
5.结构CandyBar包含3个成员。第一个成员存储了糖块的品牌；第二个成员存储糖块的重量（可以有小数）；第三个成员存储了糖块的卡路里含量（整数）。请编写一个程序，声明这个结构，创建一个名为snack的CandyBar变量，并将其成员分别初始化为“Mocha Munch”、2.3和350。初始化应在声明snack时进行。最后，程序显示snack变量的内容。
#include<iostream>
using namespace std;
struct CandyBar
{
char brand[20];
float weight;
int calorie;
};
int main()
{
CandyBar snack ={"Mocha Munch",2.3,350};
cout << snack.brand << endl;
cout << snack.weight << endl;
cout << snack.calorie << endl;
while (1);
return 0;
}
6.结构CandyBar包含3个成员，如编程练习5所示。请编写一个程序，创建一个包含3个元素的CandyBar数组，并将它们初始化为所选择的值，然后显示每个结构的内容。
#include<iostream>
using namespace std;
struct CandyBar
{
char brand[20];
float weight;
int calorie;
};
int main()
{
CandyBar snack[3] = { { "Mocha Munch", 2.3, 350 },
{ "Chewing sugar", 1.5, 250 },
{ "hard candy", 2.8, 321 } };
cout << snack[0].brand << "," << snack[0].weight << "," << snack[0].calorie << endl;
cout << snack[1].brand << "," << snack[1].weight << "," << snack[1].calorie << endl;
cout << snack[2].brand << "," << snack[2].weight << "," << snack[2].calorie << endl;
while (1);
return 0;
}
7.William Wingate从事比萨饼分析服务。对于每个比萨饼，他都需要记录下列信息：
● 披萨饼公司的名称，可以由多个单词组成。
● 披萨饼的直径。
● 披萨饼的重量。
请设计一个能够储存这些信息的结构，并编写一个使用这种结构变量的程序。程序将请求用户输入上述信息，然后显示这些信息。请使用cin（或它的方法）和cout。
#include<iostream>
using namespace std;
struct Pizza
{
char name[30];
float diameter;
float weight;
};
int main()
{
Pizza pt;
cout << "Enter the company name: ";
cin.get(pt.name, 30).get();
cout << "Enter the pizza diameter: ";
cin >> pt.diameter;
cout << "Enter the pizza weight: ";
cin >> pt.weight;
cout << "company name:" << pt.name << "，pizza diameter：" << pt.diameter << ",pizza weight：" << pt.weight << endl;
while (1);
return 0;
}
8.完成编程练习7，但使用new来为结构分配内存，而不是声明一个结构变量。另外，让程序在请求输入比萨饼公司名称之前输入比萨饼的直径。
#include<iostream>
using namespace std;
struct Pizza
{
char name[30];
float diameter;
float weight;
};
int main()
{
Pizza *py =new Pizza;
cout << "Enter the pizza diameter: ";
cin >> (*py).diameter;
cin.get();
cout << "Enter the company name: ";
cin.get(py->name, 30).get();
cout << "Enter the pizza weight: ";
cin >> py->weight;
cout << "company name:" << py->name << "，pizza diameter：" << py->diameter << ",pizza weight：" << py->weight << endl;
delete py;
while (1);
return 0;
}
注意：使用new分配内存之后一定要记得delete
9.完成编程练习6，但使用new来动态分配数组，而不是声明一个包含3个元素的CandyBar数组。
#include<iostream>
using namespace std;
struct CandyBar
{
char brand[20];
float weight;
int calorie;
};
int main()
{
CandyBar *snack = new CandyBar[3]; //动态分配数组
*snack = { "Mocha Munch", 2.3, 350 };
*(snack + 1) = { "Chewing sugar", 1.5, 250 };
*(snack + 2) = { "hard candy", 2.8, 321 };
cout << snack[0].brand << "," << snack[0].weight << "," << snack[0].calorie << endl;
cout << (*(snack + 1)).brand << "," << (*(snack + 1)).weight << "," << (*(snack + 1)).calorie << endl;
cout << (snack + 2)->brand << "," << (snack + 2)->weight << "," << (snack + 2)->calorie << endl;
delete [] snack; //注意delete的格式
while (1);
return 0;
}
10.编写一个程序，让用户输入三次40码跑的成绩（如果您愿意，也可让用户输入40米跑的成绩），并显示次数和平均成绩。请使用一个array对象来存储数据（如果编译不支持array类，请使用数组）。
#include<iostream>
#include<array>
using namespace std;
int main()
{
array<float, 3>grade; //用array对象来储存数据
cout << "请输入三次40码跑的成绩：" << endl; //1码等于三英尺，1英尺等于0.3048米，即1码等于0.9144米,这个点与此题无关
cout << "请输入第一次成绩（秒）：";
cin >> grade[0];
cout << "请输入第二次成绩（秒）：";
cin >> grade[1];
cout << "请输入第三次成绩（秒）：";
cin >> grade[2];
cout << "您3次的成绩分别为：" << grade[0] << "秒，" << grade[1] << "秒，" << grade[2] << "秒。" << endl;
cout << "平均成绩为：" << (grade[0] + grade[1] + grade[2]) / 3.0 << "秒，" << endl;
while (1);
return 0;
}
[C++ Primer Plus] 第4章、复合类型——课后习题
原文：https://www.cnblogs.com/Fionaaa/p/12260751.html