C++ Primer Plus Chapter4

C++ Primer Plus Chapter4

//4.1#include<iostream>int main(){using namespace std;const int size = 20;char fname[size],lname[size];char grade;unsigned int age;cout << "What is your first name?";cin.getline(fname, 20);cout << "What is your last name?";cin.getline(lname, 20);cout << "What letter grade do you deserve?";cin >> grade;cout << "What is your age?";cin >> age;cout << "Name: " << lname << ", " << fname << endl;cout << "Grade: " << char(grade+1) << endl;cout << "Age: " << age << endl;return 0;}

//4.2#include<iostream>#include<string>int main(){using namespace std;string fname,lname;char grade;unsigned int age;cout << "What is your first name?";getline(cin,fname);cout << "What is your last name?";getline(cin, lname);cout << "What letter grade do you deserve?";cin >> grade;cout << "What is your age?";cin >> age;cout << "Name: " << lname << ", " << fname << endl;cout << "Grade: " << char(grade+1) << endl;cout << "Age: " << age << endl;return 0;}

//4.3#include<iostream>#include<cstring>int main(){using namespace std;const int size = 20;char fname[size];char lname[size];cout << "Enter your first name: ";cin.getline(fname, 20);cout << "Enter your last name: ";cin.getline(lname, 20);char *const pn = new char[strlen(fname) + strlen(lname) + 1];strcpy(pn, fname);strcat(pn, " ");strcat(pn, lname);cout <<"Here's the information in a single string: "<< pn;delete[]pn;cout << endl;return 0;}

//4.4#include<iostream>#include<string>int main(){using namespace std;string fname;string lname;cout << "Enter your first name: ";cin >> fname;cout << "Enter your last name: ";cin >> lname;string name;name = fname + ", " + lname;cout << "Here's the information in a single string: " << name;cout << endl;return 0;}

//4.5#include<iostream>struct CandyBar{char kind[20];double weight;unsigned int Calorie;};int main(){using namespace std;CandyBar snack{"Mocha Munch", 2.3, 350};cout << snack.kind << endl;cout << snack.weight << endl;cout << snack.Calorie << endl;return 0;}

//4.6#include<iostream>struct CandyBar{char kind[20];double weight;unsigned int Calorie;};int main(){using namespace std;CandyBar snack[] = { { "Mocha Munch", 2.3, 350 }, { "阿尔卑斯", 6.3, 310 },{"优の良品", 2.1, 291} };cout << snack[0].kind << "\t" << snack[0].weight << "\t" << snack[0].Calorie << endl;cout << snack[1].kind << "\t" << snack[1].weight << "\t" << snack[1].Calorie << endl;cout << snack[2].kind << "\t" << snack[2].weight << "\t" << snack[2].Calorie << endl;return 0;}

//4.7#include<iostream>struct Pizza{char name[20];double diameter;double weight;};int main(){using namespace std;Pizza pa;cout << "Enter the name of Pizza: ";cin >> pa.name;cout << "Enter the diameter of Pizza: ";cin >> pa.diameter;cout << "Enter the weight of Pizza:";cin >> pa.weight;cout << "Name:" << pa.name << endl;cout << "Diameter:" << pa.diameter << endl;cout << "Weight: " << pa.weight << endl;return 0;}

//4.8#include<iostream>struct Pizza{char name[20];double diameter;double weight;};int main(){using namespace std;Pizza * pn = new Pizza;cout << "Enter the diameter of Pizza:";cin>>pn->diameter;cin.get();cout << "Enter the name of Pizza:";cin.get( pn->name,20);cout << "Enter the weight of Pizza: ";cin >> (*pn).weight;cout << "Name:" << pn->name << endl;cout << "Diameter:" << pn->diameter << endl;cout << "Weight: " << pn->weight << endl;return 0;}

//4.8#include <iostream>#include <string>using std::cout;using std::cin;using std::endl;using std::string;structTPizza{stringcompany_name;doublediameter;doubleweight;};int main(){TPizza*p_pizza = new TPizza;cout << "输入披萨直径（厘米）：";cin >> p_pizza->diameter;// cin忽略输入流中的空白符（回车符、空格符、制表符），回车符仍保留在输入流中cout << "输入披萨名：";cin.get(); // 提取先前留在输入流中的回车符，否则下面的getline()不会等待输入，而直接读取输入流中已有的回车符getline(cin, p_pizza->company_name);cout << "输入披萨重量（克）：";cin >> p_pizza->weight;cout << p_pizza->company_name << "公司出品直径为" << p_pizza->diameter << "厘米重量为" << p_pizza->weight << "克的披萨" << endl;delete p_pizza;p_pizza = NULL;cout << endl;return (0);}

//4.9#include<iostream>#include<string>struct CandyBar{string name;double weight;unsigned int calories;};int main(){using namespace std;const unsigned int size = 3;CandyBar *pn = new CandyBar[size];pn[0].name = "Mocha Munch";pn[0].weight = 2.3;pn[0].calories = 350;pn[1].name = "阿尔卑斯";pn[1].weight = 6.3;pn[1].calories = 310;pn[2].name = "优の良品";pn[2].weight = 2.1;pn[2].calories = 291;cout << pn[0].name << "\t" << pn[0].weight << "\t" << pn[0].calories << endl;cout << pn[1].name << "\t" << pn[1].weight << "\t" << pn[1].calories << endl;cout << pn[2].name << "\t" << pn[2].weight << "\t" << pn[2].calories << endl;delete[] pn;return 0;}

//4.10#include<iostream>#include<array>int main(){using namespace std;const unsigned int size = 3;array <double, size> grade;cout << "输入三次40码跑的成绩: ";cin >> grade[0] >> grade[1] >> grade[2];cout << "长跑次数: " << size << endl;cout << "平均成绩: " << (grade[0] + grade[1] + grade[2]) / 3 << endl;}