C++ Primer Plus（第六版） 第五章 编程练习

编程环境：Visual Studio 2017

1：

//practice 1
#include<iostream>
using namespace std;

int main()
{
	int a, b, sum;
	a = b = sum = 0;

	cout << "Enter two integer: ";
	cin >> a >> b;

	for (int i = a; i <= b; ++i)
	{
		sum += i;
	}

	cout << "The sum of all integers between " << a << " and " << b << " is " << sum << endl;

	system("pause");
	return 0;
}

2： 

//practice 2
#include<iostream>
#include<array>
//#include<iomanip>		setprecision需要的头文件
using namespace std;

const int ArSize = 16;
int main()
{
	array<long double, ArSize> factorials;
	factorials[0] = factorials[1] = 1.0;
	for (int i = 2; i < ArSize; ++i)
	{
		factorials[i] = i * factorials[i - 1];
	}

	//cout << fixed;				强制使用小数输入，防止使用科学计数法
	//cout << setprecision(0);		控制显示的精度，控制小数点后面的位数

	for (int i = 0; i < ArSize; ++i)
	{
		cout << i << "! = " << factorials[i] << endl;
	}

	system("pause");
	return 0;
}

 3：

//practice 3
#include<iostream>
using namespace std;

int main()
{
	int number = 0, sum = 0;

	cout << "Enter a number( The 0 indicates the end ): ";
	cin >> number;

	while (number != 0)
	{
		sum += number;
		cout << "The accumulative total is : " << sum << endl;
		cout << "Enter a number( The 0 indicates the end ): ";
		cin >> number;
	}

	return 0;
}

4： 

//practice 4
#include<iostream>
using namespace std;

int main()
{
	double Daphne_account = 100;
	double Cleo_account = 100;
	int years = 0;

	while (Cleo_account <= Daphne_account)
	{
		Daphne_account += 10.0;
		Cleo_account *= 1.05;
		++years;
	}

	cout << "After " << years << " years.\n";
	cout << "Daphne's investment value is " << Daphne_account << endl;
	cout << "Cleo's investment value is " << Cleo_account << endl;

	system("pause");
	return 0;
}

5： 

//practice 5
#include<iostream>
#include<string>
using namespace std;

int main()
{
	string months[12] = {"January","February","March","April","May","June","July","August","September","October","November","December" };
	int sales[12] = { 0 };
	int total_sales = 0;

	cout << "Enter sales per month: \n";

	for (int i = 0; i < 12; ++i)
	{
		cout << months[i] << ": ";
		cin >> sales[i];
		total_sales += sales[i];
	}

	cout << "\nThe total sales is " << total_sales << endl << endl;

	for (int i = 0; i < 12; ++i)
	{
		cout << months[i] << ": " << sales[i] << endl;
	}
	system("pause");
	return 0;
}

 6：

//practice 6
#include<iostream>
#include<string>
using namespace std;

int main()
{
	string months[12] = { "January","February","March","April","May","June","July","August","September","October","November","December" };
	int sales[3][12] = { 0 };
	int total_sales[3] = { 0 };

	for (int i = 0; i < 3; ++i)
	{
		cout << "\nEnter sales per month in " << i + 1 << "th year: \n";
		for (int j = 0; j < 12; ++j)
		{
			cout << months[j] << ": ";
			cin >> sales[i][j];
			total_sales[i] += sales[i][j];
		}
	}

	for (int i = 0; i < 3; ++i)
	{
		cout << i + 1 << "th year total sales is " << total_sales[i] << endl;
	}

	cout << "Three years total sales is " << total_sales[0] + total_sales[1] + total_sales[2] << endl;

	system("pause");
	return 0;
}

 7：

//practice 7
#include<iostream>
#include<string>
using namespace std;

struct car
{
	string manufacturer;
	int pro_year;
};

int main()
{
	int n = 0;
	cout << "How many cars do you wish to catalog? ";
	cin >> n;
	cin.get();

	car *pcar = new car[n];
	for (int i = 0; i < n; i++)
	{
		cout << "Car #" << i + 1 << ":" << endl;
		cout << "Please enter the manufacturer: ";
		getline(cin, pcar[i].manufacturer);

		cout << "Please enter the year made: ";
		cin >> pcar[i].pro_year;
		cin.get();
	}

	cout << "Here is your collection:" << endl;
	for (int i = 0; i < n; i++)
	{
		cout << pcar[i].pro_year << " " << pcar[i].manufacturer << endl;
	}

	system("pause");
	return 0;
}    

 8：

//practice 8
#include<iostream>
using namespace std;

int main()
{
	int n = 0;
	char word[20];

	cout << "Enter words (to stop, type the word done): " << endl;
	cin >> word;
	while (strcmp(word, "done"))
	{
		n++;
		cin >> word;
	}

	cout << "You entered a total of " << n << " words." << endl;
	system("pause");
	return 0;
}

 9：

//practice 9
#include<iostream>
#include<string>
using namespace std;

int main()
{
	int n = 0;
	string word;

	cout << "Enter words (to stop, type the word done): " << endl;
	cin >> word;
	while (word != "done")
	{
		n++;
		cin >> word;
	}

	cout << "You entered a total of " << n << " words." << endl;
	system("pause");
	return 0;
}

 10：

//practice 10
#include<iostream>
using namespace std;

int main()
{
	int n = 0;
	cout << "Enter number of rows: ";
	cin >> n;

	for (int i = 0; i < n; i++)
	{
		for (int j = 0; j < n - i; j++)
		{
			cout << ".";
		}
		for (int j = 0; j < i; j++)
		{
			cout << "*";
		}
		cout << endl;
	}
	system("pause");
	return 0;
}

才疏学浅，如有错误或者改进的建议还请大牛多多指出。

继续学习，慢慢更新。