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
1 #include<iostream> 2 using namespace std; 3 4 void main() { 5 char first_name[30], last_name[30]; 6 char grade; 7 int age; 8 cout <<"what is your first name?"; 9 gets_s(first_name);//cin.getline(first, 20); 10 cout << "what is your last name?"; 11 gets_s(last_name); 12 cout << "what letter grade do you deserve?"; 13 cin >> grade; 14 cout << "what is your age?"; 15 cin >> age; 16 17 cout << "Name:" << last_name << "," << first_name << endl; 18 cout << "Grade:" << char (grade + 1) << endl; 19 cout << "Age:" << age << endl; 20 21 system("pause"); 22 }
2 . 修改程序淸单 4.4, 使用 C+ + string 类而不是 char数组
1 #include<iostream> 2 #include<string> 3 using namespace std; 4 5 void main() { 6 string name; 7 string dessert; 8 9 cout << "What's your name?" << endl; 10 getline(cin, name); //读取用户输入的一行字符给name 11 cout << "What's your favorate dessert?" << endl; 12 getline(cin, dessert); 13 cout << "I have some delicious " << dessert << " for you." << endl; 14 system("pause"); 15 }
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 数组和头义件 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
1 #include<iostream> 2 using namespace std; 3 4 void main() { 5 char first[20],last[20]; 6 7 cout << "Enter your first name ："; 8 cin >> first; 9 cout << "Enter your last name ："; 10 cin >> last; 11 cout << "Here's the information in a single string ：" << last << "," << first << endl; 12 system("pause"); 13 }
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
1 #include<iostream> 2 #include<string> 3 using namespace std; 4 5 void main() { 6 string first,last; 7 8 cout << "Enter your first name ："; 9 cin >> first; 10 cout << "Enter your last name ："; 11 cin >> last; 12 cout << "Here's the information in a single string ：" << last << "," << first << endl; 13 system("pause"); 14 }
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。
1 #include<iostream> 2 #include<string> 3 using namespace std; 4 5 struct CandyBar 6 { 7 char kind[30]; 8 double weight; 9 int energy; 10 }; 11 12 void main() { 13 CandyBar snack = { "Mocha Munch",2.3,350}; 14 15 cout << snack.kind<<endl; 16 cout << snack.weight << endl; 17 cout << snack.energy<< endl; 18 system("pause"); 19 }
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。
1 #include<iostream> 2 #include<string> 3 using namespace std; 4 5 struct CandyBar 6 { 7 char kind[30]; 8 double weight; 9 int energy; 10 }; 11 12 void main() { 13 CandyBar snack[3] = { {"Mocha Munch",2.3,350}, 14 {"wu can rou",2.5,550}, 15 {"qi cai hong",1.5,150 } }; 16 17 cout << snack[0].kind<<"," << snack[0].weight << "," << snack[0].energy <<endl; 18 cout << snack[1].kind << "," << snack[1].weight << "," << snack[1].energy << endl; 19 cout << snack[2].kind << "," << snack[2].weight << "," << snack[2].energy << endl; 20 system("pause"); 21 }
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。
1 #include<iostream> 2 using namespace std; 3 4 struct Pizza 5 { 6 char company[30]; 7 double diameter; 8 double weight; 9 }; 10 11 void main() { 12 int flag = 1; 13 while (flag) 14 { 15 Pizza p; 16 cout << "请输入公司名："; 17 cin.getline(p.company,30); 18 cout << "请输入披萨直径："; 19 cin >> p.diameter; 20 cout << "请输入披萨重量："; 21 cin >> p.weight; 22 cout << "公司名：" << p.company << "，披萨直径：" << p.diameter << ",披萨重量：" << p.weight << endl; 23 24 cout << "-----------------------------------------------------------------" << endl; 25 cout << "输入数字0退出，输入其他数字继续："; 26 cin >> flag; 27 cin.get(); 28 } 29 //system("pause"); 30 }
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。
1 #include<iostream> 2 #include<string> 3 using namespace std; 4 5 struct Pizza 6 { 7 char company[30]; 8 double diameter; 9 double weight; 10 }; 11 12 void main() { 13 int flag = 1; 14 while (flag) 15 { 16 Pizza *p=new Pizza; 17 cout << "请输入披萨直径："; 18 cin >> (*p).diameter; 19 cin.get();//读取掉换行符 20 cout << "请输入公司名："; 21 cin.getline((*p).company,30); 22 cout << "请输入披萨重量："; 23 cin >> (*p).weight; 24 cout << "公司名：" << (*p).company << "，披萨直径：" << (*p).diameter << ",披萨重量：" << (*p).weight << endl; 25 delete p; 26 27 cout << "-----------------------------------------------------------------" << endl; 28 cout << "输入数字0退出，输入其他数字继续："; 29 cin >> flag; 30 cin.get(); 31 } 32 //system("pause"); 33 }
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。
1 #include<iostream> 2 using namespace std; 3 4 struct CandyBar 5 { 6 char kind[30]; 7 double weight; 8 int energy; 9 }; 10 11 void main() { 12 CandyBar *p = new CandyBar; 13 *p = { "Mocha Munch",2.3,350 }; 14 *(p + 1) = {"wu can rou", 2.5, 550}; 15 *(p + 2) = { "qi cai hong",1.5,150 }; 16 17 cout << p[0].kind << "," << p[0].weight << "," << p[0].energy << endl; 18 cout << (*(p + 1)).kind << "," << (*(p + 1)).weight << "," << (*(p + 1)).energy << endl; 19 cout << (p + 2)->kind << "," << (p + 2)->weight << "," << (p + 2)->energy << endl; 20 21 delete p; 22 system("pause"); 23 }
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）。
1 #include<iostream> 2 #include<array> 3 using namespace std; 4 5 void main() { 6 array<double, 3> a; 7 cout << "请输入三次百米跑的成绩。" << endl; 8 cout << "请输入第一次的成绩（秒）："; 9 cin >> a[0]; 10 cout << "请输入第二次的成绩（秒）："; 11 cin >> a[1]; 12 cout << "请输入第三次的成绩（秒）："; 13 cin >> a[2]; 14 15 cout << "您3次的成绩分别为：" << a[0] << "秒，" << a[1] << "秒，" << a[2] << "秒。"<<endl; 16 cout << "平均成绩为：" << (a[0] + a[1] + a[2]) / 3.0 << "秒，" << endl; 17 18 system("pause"); 19 }
