//本博主所写的代码仅为阅读者提供参考；
//若有不足之处请提出，博主会尽所能修改；
//附上课后编程练习题目；
//若是对您有用的话请点赞或分享提供给它人；
//--------------------------------------------------------------------------------------------------------------;
//--------------------------------------------------------------------------------------------------------------;
//2.7 - 1.cpp
#include <iostream>
using namespace std;
int main()
{
cout << "My name is C++ Primer Plus." << endl;
cout << "My address is in library." << endl;
return 0;
}
//-------------
//2.7 - 2.cpp
#include <iostream>
using namespace std;
int main()
{
double long_distance;
cout << "Enter a distance for long unit: ";
cin >> long_distance;
cout << long_distance << " long distance ";
cout << "is equal to ";
long_distance *= 220.0;
cout << long_distance << " yard distance." << endl;
return 0;
}
//-------------
//2.7 - 3.cpp
#include <iostream>
using namespace std;
void show_mice();
void show_running();
int main()
{
show_mice();
show_mice();
show_running();
show_running();
return 0;
}
void show_mice()
{
cout << "Three blind mice" << endl;
return;
}
void show_running()
{
cout << "See how they run" << endl;
return;
}
//-------------
//2.7 - 4.cpp
#include <iostream>
using namespace std;
int main()
{
int age_total_months;
cout << "Enter your age: ";
cin >> age_total_months;
cout << "Your age includes " << age_total_months * 12 << " months." << endl;
return 0;
}
//-------------
//2.7 - 5.cpp
#include <iostream>
using namespace std;
double temperature(double temp);
int main()
{
double celsius;
cout << "Please enter a Celsius value: ";
cin >> celsius;
cout << celsius << " degrees Celsius is ";
cout << temperature(celsius);
cout << " degrees Fahrenheit." << endl;
return 0;
}
double temperature(double temp)
{
return 1.8 * temp + 32.0;
}
//-------------
//2.7 - 6.cpp
#include <iostream>
using namespace std;
double transform(double temp);
int main()
{
double light_years;
cout << "Enter the number of light years: ";
cin >> light_years;
cout << light_years << " light years = ";
cout << transform(light_years);
cout << " astronomical units." << endl;
return 0;
}
double transform(double temp)
{
return temp * 63240.0;
}
//-------------
//2.7 - 7.cpp
#include <iostream>
using namespace std;
void show_time(int hour, int minute);
int main()
{
int hour, minute;
cout << "Enter the number of hours: ";
cin >> hour;
cout << "Enter the number of minutes: ";
cin >> minute;
show_time(hour, minute);
return 0;
}
void show_time(int hour, int minute)
{
cout << "Time: " << hour << ":" << minute << endl;
return;
}
//-------------
//3.7 - 1.cpp
#include <iostream>
using namespace std;
int main()
{
const int INCH_PER_FEET = 12;
int height;
cout << "Please enter your height in inch: ___\b\b\b";
cin >> height;
cout << "Your height is " << height / INCH_PER_FEET << " feet and ";
cout << height % INCH_PER_FEET << " inches." << endl;
return 0;
}
//-------------
//3.7 - 2.cpp
#include <iostream>
using namespace std;
int main()
{
const int INCH_PER_FEET = 12; //1英尺为12英寸;
const double POUND_PER_KG = 2.2; //1千克为2.2磅;
const double METER_PER_INCH = 0.0254; //1英寸为0.0254米;
double height_feet, height_inch, weight, meter;
cout << "Please enter your height in feet and inch: ";
cin >> height_feet >> height_inch;
cout << "Please enter your weight in pound: ";
cin >> weight;
cout << "Your height is " << height_feet * INCH_PER_FEET + height_inch << " inches." << endl;
meter = (height_feet * INCH_PER_FEET + height_inch) * METER_PER_INCH;
cout << "Your BMI is " << (weight / POUND_PER_KG) / (meter * meter) << "." << endl;
return 0;
}
//-------------
//3.7 - 3.cpp
#include <iostream>
using namespace std;
int main()
{
const double MINUTE_PER_DEGREE = 60.0;
const double SECOND_PER_MINUTE = 60.0;
double degree, minute, second, total;
cout << "Enter a latitude in degrees, minutes, and seconds:" << endl;
cout << "First, enter the degrees: ";
cin >> degree;
cout << "Next, enter the minutes of arc: ";
cin >> minute;
cout << "Finally, enter the seconds of arc: ";
cin >> second;
total = degree + (minute / MINUTE_PER_DEGREE) + (second / (MINUTE_PER_DEGREE * SECOND_PER_MINUTE));
cout << degree << " degrees, ";
cout << minute << " minutes, ";
cout << second << " seconds = ";
cout << total << " degrees" << endl;
return 0;
}
//-------------
//3.7 - 4.cpp
#include <iostream>
using namespace std;
int main()
{
const int HOUR_PER_DAY = 24; //1天有24小时;
const int MINUTE_PER_HOUR = 60; //1小时有60分钟;
const int SECOND_PER_MINUTE = 60; //1分钟有60秒;
long long second;
cout << "Enter the number of seconds: ";
cin >> second;
cout << second << " seconds = ";
cout << second / (HOUR_PER_DAY * MINUTE_PER_HOUR * SECOND_PER_MINUTE);
cout << " days, ";
cout << second / (SECOND_PER_MINUTE * MINUTE_PER_HOUR) % HOUR_PER_DAY;
cout << " hours, ";
cout << second % (SECOND_PER_MINUTE * MINUTE_PER_HOUR) / SECOND_PER_MINUTE;
cout << " minutes, ";
cout << second % SECOND_PER_MINUTE;
cout << " seconds" << endl;
return 0;
}
//-------------
//3.7 - 5.cpp
#include <iostream>
using namespace std;
int main()
{
long long world_population;
long long china_population;
cout << "Enter the world's population: ";
cin >> world_population;
cout << "Enter the population of the China: ";
cin >> china_population;
cout << "The population of the China is ";
cout << double(china_population) / world_population * 100LL;
cout << "% of the world population." << endl;
return 0;
}
//-------------
//3.7 - 6.cpp
#include <iostream>
using namespace std;
int main()
{
double kilometer, liter;
cout << "Please enter your driving distance(km): ";
cin >> kilometer;
cout << "Please enter your gas consumption(liter): ";
cin >> liter;
cout << "You consume " << liter / kilometer * 100;
cout << " liter gas for driving per 100 km." << endl;
return 0;
}
//-------------
//3.7 - 7.cpp
#include <iostream>
using namespace std;
int main()
{
const double MILE_PER_KM = 0.6214; //1公里是0.6214英里;
const double LITER_PER_GALLON = 3.875; //1加仑是3.875升;
double kilometer, liter;
cout << "Please enter your driving distance(km): ";
cin >> kilometer;
cout << "Please enter your gas consumption(liter): ";
cin >> liter;
cout << "You consume " << liter / kilometer * 100;
cout << " liter gas for driving per 100 km (European style)." << endl;
cout << "You drive " << kilometer * MILE_PER_KM / liter * LITER_PER_GALLON;
cout << " miles for per gallon (American style)." << endl;
return 0;
}
//-------------
//4.13 - 1.cpp
#include <iostream>
#include <string>
using namespace std;
int main()
{
int age;
char grade;
string fname, lname;
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: " << ++grade << endl;
cout << "Age: " << age << endl;
return 0;
}
//-------------
//4.13 - 2.cpp
#include <iostream>
#include <string>
using namespace std;
int main()
{
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;
}
//-------------
//4.13 - 3.cpp
#include <iostream>
#include <cstring>
using namespace std;
int main()
{
const int ArSize = 20;
char fname[ArSize];
char lname[ArSize];
cout << "Enter your first name: ";
cin.getline(fname, ArSize);
cout << "Enter your last name: ";
cin.getline(lname, ArSize);
char name[strlen(fname) + strlen(lname) + 4]; //+4为了用于连接逗号和空格以及其中的空字符;
strcpy(name, lname);
strcat(name, ", ");
strcat(name, fname);
cout << "Here's the information in a single string: ";
cout << name << endl;
return 0;
}
//-------------
//4.13 - 4.cpp
#include <iostream>
#include <string>
using namespace std;
int main()
{
string fname, lname;
cout << "Enter your first name: ";
getline(cin, fname);
cout << "Enter your last name: ";
getline(cin, lname);
lname += ", " + fname;
cout << "Here's the information in a single string: ";
cout << lname << endl;
return 0;
}
//-------------
//4.13 - 5.cpp
#include <iostream>
#include <string>
using namespace std;
struct CandyBar
{
string brand;
double candy_weight;
int candy_calorie;
};
int main()
{
CandyBar snack = {
"Mocha Munch", 2.3, 350};
cout << "Brand : " << snack.brand << endl;
cout << "Candy_weight: " << snack.candy_weight << endl;
cout << "Candy_calorie: " << snack.candy_calorie << endl;
return 0;
}
//-------------
//4.13 - 6.cpp
#include <iostream>
#include <string>
using namespace std;
struct CandyBar
{
string brand;
double candy_weight;
int candy_calorie;
};
int main()
{
CandyBar snack[3] =
{
{
"Mocha Munch", 2.3, 350},
{
"Mooncake", 3.5, 369},
{
"Birthdaycake", 6.8, 460}
};
cout << "The first candy:" << endl;
cout << "Brand: " << snack[0].brand << endl;
cout << "Candy_weight: " << snack[0].candy_weight << endl;
cout << "Candy_calorie: " << snack[0].candy_calorie << endl;
cout << "\nThe second candy:" << endl;
cout << "Brand: " << snack[1].brand << endl;
cout << "Candy_weight: " << snack[1].candy_weight << endl;
cout << "Candy_calorie: " << snack[1].candy_calorie << endl;
cout << "\nThe third candy:" << endl;
cout << "Brand: " << snack[2].brand << endl;
cout << "Candy_weight: " << snack[2].candy_weight << endl;
cout << "Candy_calorie: " << snack[2].candy_calorie << endl;
return 0;
}
//-------------
//4.13 - 7.cpp
#include <iostream>
#include <string>
using namespace std;
struct Pizza
{
string pizza_company;
double pizza_diameter;
double pizza_weight;
};
int main()
{
Pizza snack;
cout << "Please enter the name of the Pizza Company: ";
getline(cin, snack.pizza_company);
cout << "Please enter the diameter of the pizza: ";
cin >> snack.pizza_diameter;
cout << "Please enter the weight of the pizza: ";
cin >> snack.pizza_weight;
cout << "The name of the Pizza Company: " << snack.pizza_company << endl;
cout << "The diameter of the Pizza Company: " << snack.pizza_diameter << endl;
cout << "The weight of the Pizza Company: " << snack.pizza_weight << endl;
return 0;
}
//-------------
//4.13 - 8.cpp
#include <iostream>
#include <string>
using namespace std;
struct Pizza
{
string pizza_company;
double pizza_diameter;
double pizza_weight;
};
int main()
{
Pizza *snack = new Pizza;
cout << "Please enter the diameter of the pizza: ";
(cin >> snack->pizza_diameter).get();
cout << "Please enter the name of the Pizza Company: ";
getline(cin, snack->pizza_company);
cout << "Please enter the weight of the pizza: ";
cin >> snack->pizza_weight;
cout << "The name of the Pizza Company: " << snack->pizza_company << endl;
cout << "The diameter of the Pizza Company: " << snack->pizza_diameter << endl;
cout << "The weight of the Pizza Company: " << snack->pizza_weight << endl;
delete snack;
return 0;
}
//-------------
//4.13 - 9.cpp
#include <iostream>
#include <string>
using namespace std;
struct CandyBar
{
string brand;
double candy_weight;
int candy_calorie;
};
int main()
{
CandyBar *snack = new CandyBar[3];
snack[0] = {
"Mocha Munch", 2.3, 350};
snack[1] = {
"Mooncake", 3.5, 369};
snack[2] = {
"Birthdaycake", 6.8, 460};
cout << "The first candy:" << endl;
cout << "Brand: " << snack[0].brand << endl;
cout << "Candy_weight: " << snack[0].candy_weight << endl;
cout << "Candy_calorie: " << snack[0].candy_calorie << endl;
cout << "\nThe second candy:" << endl;
cout << "Brand: " << snack[1].brand << endl;
cout << "Candy_weight: " << snack[1].candy_weight << endl;
cout << "Candy_calorie: " << snack[1].candy_calorie << endl;
cout << "\nThe third candy:" << endl;
cout << "Brand: " << snack[2].brand << endl;
cout << "Candy_weight: " << snack[2].candy_weight << endl;
cout << "Candy_calorie: " << snack[2].candy_calorie << endl;
delete[] snack;
return 0;
}
//-------------
//4.13 - 10.cpp
#include <iostream>
#include <array>
using namespace std;
int main()
{
array<double, 3> scores;
cout << "Please enter your the results of the first 40 meter race: ";
cin >> scores[0];
cout << "Please enter your the results of the second 40 meter race: ";
cin >> scores[1];
cout << "Please enter your the results of the third 40 meter race: ";
cin >> scores[2];
cout << "You ran three times in total." << endl;
cout << "Your average score is ";
cout << (scores[0] + scores[1] + scores[2]) / 3.0;
cout << "." << endl;
return 0;
}
//-------------
//------------------------------------------2020年9月20日 ----------------------------------------------;