Code已使用g++编译并调试通过
- 1.编写一个c++程序，如下述输出示例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(void)
{
string first_name,last_name;
unsigned int age;
char grade;
cout << "What is your first name? ";
getline(cin, first_name);
cout << "What is your last name? ";
getline(cin,last_name);
cout << "What is your age? ";
cin >> age;
cout << "What letter grade do you deserve? ";
cin >> grade;
cout << "Name : "<< last_name << ","<< first_name <<endl;
cout << "Grade : "<<++grade<<endl;
cout << "Age : "<<age<<endl;
return 0;
}- 修改程序清单 4.4 ，使用C++ string类而不是char数组。
#include <iostream>
using namespace std;
int main(void)
{
string name,dessert;
cout << "Enter your name : \n";
getline(cin,name);
cout << "Enter your favorite dessert : \n";
getline(cin,dessert);
cout << "I have some delicious "<< dessert;
cout << " for you , "<< name << ".\n";
return 0;
}- 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一个空格将姓和名组合起来，并存储和显示结合效果，请使用char数组和头文件cstring中的函数。下面是该程序的运行时的情形：
Enter your first name: Flip
Enter your last name: Fleaming
Here's the information in a single string: Fleming, Flip
完整Code：
#include <iostream>
#include <cstring>
using namespace std;
int main(void)
{
char first_name[20];
string last_name;
cout << "Enter your first name: ";
cin.getline(first_name,20);
cout << "Enter your last name: ";
getline(cin,last_name);
cout << "Here's the information in a single string: " << last_name << ", "<<first_name << endl;
return 0;
}- 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一个空格将姓和名组合起来，并存储和显示结合效果，请使用string对象和头文件cstring中的函数。下面是该程序的运行时的情形：
Enter your first name: Flip
Enter your last name: Fleaming
Here's the information in a single string: Fleming, Flip
完整Code
#include <iostream>
#include <cstring>
using namespace std;
int main(void)
{
string first_name,last_name;
cout << "Enter your first name: ";
getline(cin,first_name);
cout << "Enter your last name: ";
getline(cin,last_name);
cout << "Here's the information in a single string: " << last_name << ", "<<first_name << endl;
return 0;
}- 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CandBar变量，并将其成员分别初始化为“Mocha Munch”、2.3和350。初始化在声明snack时进行。最后，程序显示snack变量的内容。
#include <iostream>
#include <cstring>
using namespace std;
struct CandyBar{
string brand;
float candy_weight;
int calorie;
}; /*注意分号*/
int main(void)
{
CandyBar snack = {"Mocha Munch",2.3,350};
cout << "糖的品牌："<<snack.brand << endl;
cout << "糖的重量："<< snack.candy_weight<<endl;
cout << "糖的卡路里："<< snack.calorie<<endl;
return 0;
}- 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，并将他们初始化为所选择的值，然后显示每个结构的内容。
#include <iostream>
#include <cstring>
using namespace std;
struct CandyBar{
string brand;
float candy_weight;
int calorie;
};
int main(void)
{
CandyBar snack[3] = {
{"Mocha Munch_00",2.3,350},
{"Mocha Munch_01",2.4,355},
{"Mocha Munch_02",2.5,360}
};
cout << " brand candy_wieght calorie"<<endl;
for (int i = 0;i<3;i++){
cout << snack[i].brand<<" "<<snack[i].candy_weight
<<" "<<snack[i].calorie<<endl;
}
return 0;
}- William Wingate从事披萨分析服务。对于每个披萨饼，他都需要记录下列信息：
披萨饼公司的名称，可以有多个单词组成。
披萨饼的直径
披萨饼的重量
请设计一个能够存储这些信息的结构，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>
#include <cstring>
using namespace std;
struct pizza_info{
string company;
float diameter;
float weight;
}pizza;
int main(void)
{
cout << "please input company of pizza : ";
getline(cin,pizza.company);
cout << "please input weight of pizza : ";
cin >> pizza.weight;
cout << "please input diameter of pizza : ";
cin >> pizza.diameter;
cout << "Company is : "<<pizza.company << "Weight is : "
<< pizza.weight<<" , Diameter is : "<<pizza.diameter<<endl;
return 0;
}- 完成编程练习7，但使用new来为结构动态分配内存，而不是声明一个结构变量。另外，让程序在请求输入披萨名称之前输入披萨直径。
#include <iostream>
#include <cstring>
using namespace std;
struct pizza_info{
string company;
float diameter;
float weight;
};
int main(void)
{
pizza_info *p = new pizza_info;
cout << "please input diameter of pizza : ";
cin >> p->diameter;
cin.get();/*处理换行符，为下一行的读取做出准备*/
cout << "please input company of pizza : ";
getline(cin,p->company);
cout << "please input weight of pizza : ";
cin >> p->weight;
cout << "Company is : "<<p->company << " Weight is : "
<< p->weight<<" , Diameter is : "<<p->diameter<<endl;
return 0;
}- 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的数组。
#include <iostream>
#include <cstring>
using namespace std;
struct CandyBar{
string brand;
float candy_weight;
int calorie;
};
int main(void)
{
CandyBar *snack = new CandyBar[3];
for (int i = 0;i<3;i++)
snack[i] = {"Mocha Munch",2.3,350};
cout << " brand candy_wieght calorie"<<endl;
for (int i = 0;i<3;i++){
cout << snack[i].brand<<"_0"<<i<<" "<<snack[i].candy_weight
<<" "<<snack[i].calorie<<endl;
}
delete[] snack;
return 0;
}- 编写一个程序，让用户输入三次40码跑的成绩（如果你愿意，也可以让用户输入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（如果编译器不支持array类，请使用数组）。
#include <iostream>
#include <array>
using namespace std;
const int times =3;
int main(void)
{
array<double,times>grade;
cout << "please input your first grade : ";
cin >> grade[0];
cout << "please input your second grade : ";
cin >> grade[1];
cout << "please input your third grade : ";
cin>> grade[2];
double average = (grade[0] + grade[1] + grade[2])/times;
cout <<times << " times average is "<< average <<endl;
return 0;
}