C++ Primer Plus(第6版)Chapter 4 编程题答案

C++ Primer Plus(第6版)Chapter 4 编程题答案

第1题：

//  task 1#include <iostream>#include <string>#include <cstring>#include <array>int main(){    using namespace std;    cout << "What is your first name? ";       char fname[20];    cin.getline(fname, 20);       //getline(), 因为Betty Sue之间有空格    cout << "What is your last name? ";    char lname[20];    cin.getline(lname, 20);   //Yewe    cout << "What letter grade do you deserve? ";     char score;    cin >> score;   //B    cout << "What is your age? ";    int age;    cin >> age;  //22    cout << "Name: " << lname << ", " << fname << endl;    cout << "Grade: " << char(score + 1) << endl;    cin.get();    cin.get();    return 0;}

第2题：

//  task 2int main(){    using namespace std;    string name, dessert;    cout << "Enter your name:\n";    getline(cin, name);    cout << "Enter your favorite dessert:\n";    getline(cin, dessert);    cout << "T have some delicious " << dessert;    cout << " for you, " << name << ".\n";    cin.get();    cin.get();    return 0;}

第3题：

//  task 3int main(){    using namespace std;    cout << "Enter your first name: ";    char fname[20];    cin.getline(fname, 20);    cout << "Enter your last name: ";    char lname[20];    cin.getline(lname, 20);    char name[40];    strcpy_s(name, lname);    //加上  _s  for safe    strcat_s(name, ", ");    strcat_s(name, fname);    cout << "Here's the information in a single string: " << name;    cin.get();    cin.get();    return 0;}

第4题：

//  task 4int main(){    using namespace std;    string fname, lname, name;    cout << "Enter your first name: ";    getline(cin, fname);    cout << "Enter your last name: ";    getline(cin, lname);    name = lname + ", " + fname;    cout << "Here's the information in a single string: " << name;    cin.get();    cin.get();    return 0;}

第5题：

//  task 5int main(){    using namespace std;    struct CandyBar    {           char band[20];        float weight;        int colory;    };    CandyBar snack = { "Mocha Munch", 2.3, 350 };    cout << "The band is " << snack.band << endl;    cout << "The weight is " << snack.weight << endl;    cout << "The kaluli is " << snack.colory << endl;    cin.get();    cin.get();    return 0;}

第6题：

//  task 6int main(){    using namespace std;    struct CandyBar    {        char band[20];        float weight;        int colr;    };    // 创建一个结构数组并初始化    CandyBar snacks[3] = { { "Mocha Munch", 2.3, 350 }, { "star bucks", 1.8, 200 }, { "hagendasi", 4.9, 638 } };    cout << "The 1st band is " << snacks->band << endl;    cout << "The 1st weight is " << snacks->weight << endl;    cout << "The 1st kaluli is " << snacks->colr << endl;    cout << "The 2st band is " << (snacks + 1)->band << endl;    cout << "The 2st weight is " << (snacks + 1)->weight << endl;    cout << "The 2st kaluli is " << (snacks + 1)->colr << endl;    cout << "The 3st band is " << (snacks + 2)->band << endl;    cout << "The 3st weight is " << (snacks + 2)->weight << endl;    cout << "The 3st kaluli is " << (snacks + 2)->colr << endl;    cin.get();    cin.get();    return 0;}

第7题：

//  task 7int main(){    using namespace std;    struct pizza    {        string name;        float d;        float weight;    };    pizza bishengke;    cout << "Enter the name: ";    getline(cin, bishengke.name);    cout << "Enter the zhijing: ";    cin >> bishengke.d;    cout << "Enter the weight: ";    cin >> bishengke.weight;    cout << "The band is: " << bishengke.name << endl;    cout << "The zhijing is: " << bishengke.d << endl;    cout << "The weight is: " << bishengke.weight << endl;    cin.get();    cin.get();    return 0;}

第8题：

//  task 8int main(){    using namespace std;    struct pizza    {        string name;        float d;        float weight;    };    pizza* pt = new pizza;    cout << "Enter the zhijing: ";    cin >> pt->d;    cout << "Enter the name: ";    cin.get();   //用来吃掉回车，不能少    getline(cin, pt->name);    cout << "Enter the weight: ";    cin >> pt->weight;    cout << "The band is: " << pt->name << endl;    cout << "The zhijing is: " << pt->d << endl;    cout << "The weight is: " << pt->weight << endl;    cin.get();    cin.get();    return 0;}

第9题：

//  task 9int main(){    using namespace std;    struct CandyBar    {        char band[20];        float weight;        int colr;    };    // 动态创建一个结构数组    CandyBar* snacks = new CandyBar[3];    snacks[0] = { "Mocha Munch", 2.3, 350 };    snacks[1] = { "Star Bucks", 1.8, 200 };    snacks[2] = { "HaGenDaSi", 4.9, 645 };    cout << "The 1st band is " << snacks->band << endl;    cout << "The 1st weight is " << snacks->weight << endl;    cout << "The 1st kaluli is " << snacks->colr << endl;    cout << "The 2st band is " << (snacks + 1)->band << endl;    cout << "The 2st weight is " << (snacks + 1)->weight << endl;    cout << "The 2st kaluli is " << (snacks + 1)->colr << endl;    cout << "The 3st band is " << (snacks + 2)->band << endl;    cout << "The 3st weight is " << (snacks + 2)->weight << endl;    cout << "The 3st kaluli is " << (snacks + 2)->colr << endl;    delete[] snacks;    cin.get();    cin.get();    return 0;}

第10题：

//  task 10int main(){    using namespace std;    cout << "Enter the three score: ";    array<double, 3> scores;    cin >> scores[0];    cin >> scores[1];    cin >> scores[2];    double av = (scores[0] + scores[1] + scores[2]) / 3;    cout << "The average score of 3 is: " << av << endl;    cin.get();    cin.get();    return 0;}