C++ Primer Plus 编程练习4.13

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//4.13编程练习

#include <iostream>
#include<string>
#include <vector>   
#include <array>    

using namespace std;
int main1()
{
	char firstname[128];
	char lastname[128];
	char grade;
	int age;

	cout << "What is your first name? ";
	cin.getline(firstname, 128);
	cout << "What is your last name? ";
	cin.getline(lastname, 128);
	cout << "What letter grade do you deserve? ";
	cin >> grade;
	cout << "What is your age? ";
	cin >> age;
	cout << "Name: " << lastname << ", " << firstname << endl;
	cout << "Grade: " << char(grade + 5) << endl;
	cout << "Age: " << age << endl;

	return 0;
}

int main2()
{
	string name;
	string 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;
}

int main3 4()
{
	char firstname[50];
	char lastname[50];
	//string lastname;

	cout << "Enter your first name? ";
	cin.getline(firstname, 50);
	cout << "Enter your last name? ";
	cin.getline(lastname, 50);
	strcat(lastname, ", ");
	strcat(lastname, firstname);
	//strncat(lastname, firstname, 50);
	cout << "Here's your infomation is a single string: " << lastname << endl;
	//getline(cin, lastname);
	//cout << "Here's your infomation is a single string: " << lastname << ", " << firstname << endl;

	return 0;
}

int main5()
{
	struct CandyBar{
		char brand[20];
		double weight;
		int calory;
	};
	CandyBar snack = { "Mocha Munch", 2.3, 350 };
	cout << "brand: " << snack.brand << endl;
	cout << "weight: " << snack.weight << endl;
	cout << "calory: " << snack.calory << endl;

	return 0;
}

int main6()
{
	struct CandyBar{
		char brand[20];
		double weight;
		int calory;
	};
	CandyBar snack[3] = {
		{ "Mocha Munch", 2.3, 350 },
		{ "Xufuji",5.2,132 },
		{ "Kaixin",55.2,150 }
	};
	for (int i = 0; i < 3; i++){
		cout << "brand: " << snack[i].brand << endl;
		cout << "weight: " << snack[i].weight << endl;
		cout << "calory: " << snack[i].calory << endl << endl;
		//cout << snack[i].brand << endl
		//	<< snack[i].weight << endl
		//	<<snack[i].calory << endl;
	}
	
	return 0;
}

struct pizza{
	char company[20];
	double diameter;
	int weight;
};

int main7()
{

	pizza pie;
	cout << "Enter the name of company: ";
	cin.getline(pie.company, 20);
	cout << "Enter the pidmeter of pizza: ";
	cin >> pie.diameter;
	cout << "Enter the weight of pizza: ";
	cin >> pie.weight;
		cout << "company: " << pie.company<< endl
		<< "diameter: " << pie.diameter << endl
		<< "weight: " << pie.weight << endl;

	return 0;
}

int main8()
{

	pizza *p=new pizza;

	cout << "Enter the pidmeter of pizza: ";
	(cin>>p->diameter).get();
	cout << "Enter the name of company: ";
	cin.getline(p->company, 20);
	cout << "Enter the weight of pizza: ";
	cin >> p->weight;
	cout << "company: " << p->company << endl
		<< "diameter: " << (*p).diameter << endl
		<< "weight: " << p->weight << endl;
	delete p;
	return 0;
}

int main9()
{
	struct CandyBar{
		string brand;
		double weight;
		int calory;
	};
	CandyBar *snack = new CandyBar[3];
	snack[0].brand = "Mocha Munch";
	snack[0].weight = 2.3;
	snack[0].calory = 350;
	snack[1].brand = "Xufuji";
	snack[1].weight = 5.2;
	snack[1].calory = 132;
	snack[2].brand = "Kaixin";
	snack[2].weight = 6.2;
	snack[2].calory = 150;
	for (int i = 0; i < 3; i++){
		cout << "brand: " << snack[i].brand << endl;
		cout << "weight: " << snack[i].weight << endl;
		cout << "calory: " << snack[i].calory << endl << endl;
	}
	delete [] snack;
	return 0;
}

int main10(){

	array<double, 4> time;
	//double time[4];   数组方法
	cout<<"Enter three results time of runing 40 meters: "<<endl;
	cin >> time[0] >> time[1] >> time[2];
	time[3] = (time[0] + time[1] + time[2]) / 3;
	cout << "first time: " << time[0] <<endl
		<<"second time: " << time[1] << endl
		<< "third time: " << time[2] << endl;
	cout << "Average result: " << time[3]<<endl;

	return 0;
}