学步园

2.

/*2014. 01. 15 by Arby*/
/*c++ primer 第九章编程练习*/
// static.cpp -- using a static local variable
#include <iostream>
#include <string>
#include <cstring>
using namespace std;
// constants
const int ArSize = 10;

// function prototype
void strcount(const string str);

int main()
{
	/*初始化*/
    string input;

	/*操作*/
    cout << "Enter a line:\n";
    getline(cin, input);
    while (cin)
    {
        strcount(input);
        cout << "Enter next line (empty line to quit):\n";
        getline(cin, input);
    }
    cout << "Bye\n";

	cin.get();
	cin.get();
    return 0;
}

void strcount(const string  str)
{
    static int total = 0;        // static local variable
    int count = 0;               // automatic local variable

    cout << "\"" << str <<"\" contains ";
	count = str.length();
    total += count;
    cout << count << " characters\n";
    cout << total << " characters total\n";
}

3.

/*2014. 01. 15 by Arby*/
/*c++ primer 第九章编程练习*/
// static.cpp -- using a static local variable
#include <iostream>
using namespace std;

struct chaff
{
	char dross[20];
	int slag;
};

char buffer[100];

int main()
{
	/*初始化*/
	chaff *member = new (buffer) chaff[2]; 

	/*操作*/
	strcpy(member[0].dross, "xiaoke");
	member[0].slag = 10;
	strcpy(member[1].dross, "xiaochui");
	member[1].slag = 20;

	cout << (void*)buffer << endl;
	cout << &member[0].dross << endl;

	cin.get();
	cin.get();
    return 0;
}

4.

#ifndef GOLF_H
#define GOLF_H

namespace SALES
{
	const int	QUARTERS = 4;
	struct Sales
	{
		double sales[QUARTERS];
		double average;
		double max;
		double min;
	};


	void setSales(Sales &s, const double ar[], int n);

	void setSales(Sales &s);

	void showSales(const Sales &s);

};

#endif 

#include <iostream>  /*在系统中查找*/
using namespace std;
#include "golf.h"    /*在文件中查找*/

namespace SALES
{
	void setSales(Sales &s, const double ar[], int n)
	{
		int i = 0;
		int totle = 0;
		s.max = 0;

		if(n > 4)   //n > 4
		{
			for(i = 0; i < 4; i++)
			{
				s.sales[i]= ar[i];
				totle = totle + s.sales[i];
				if(s.sales[i] > s.max)
					s.max = s.sales[i];
			}

			s.average = totle / 4;
			s.min = s.sales[0];
			for(i = 0; i < 4; i++)
			{
				if(s.min > s.sales[i])
					s.min = s.sales[i];
			}

		}   //end if
		else   //n < 4
		{
			for(i = 0; i < n; i++)
			{
				s.sales[i]= ar[i];
				totle = totle + s.sales[i];
				if(s.sales[i] > s.max)
					s.max = s.sales[i];
			}

			s.average = totle / n;
			s.min = s.sales[0];
			for(i = 0; i < n; i++)
			{
				if(s.min > s.sales[i])
					s.min = s.sales[i];
			}
		}  // end else
	}

	void setSales(Sales &s)
	{
		int i = 0;
		int totle = 0;
		s.max = 0;

		cout << "enter the 4 sales: " << endl;
		for(i = 0; i < 4; i++)
		{
			cin >> s.sales[i];
			totle = totle + s.sales[i];
			if(s.sales[i] > s.max)
					s.max = s.sales[i];
		}
		s.min = s.sales[0];
		for(i = 0; i < 4; i++)
		{
			if(s.min > s.sales[i])
				s.min = s.sales[i];
		}
	}


	void showSales(const Sales &s)
	{
		for(int i = 0; i < 4; i++)
		{
			cout << "the " << i << " is: "<< s.sales[i] << endl;
		}
		cout << "the average is: "<< s.average<< endl;
		cout << "the max is: "<< s.max << endl;
		cout << "the min is: " << s.min <<endl;
	}
}

/*2014. 01. 15 by Arby*/
/*c++ primer 第九章编程练习*/
// 名称空间
#include <iostream>
using namespace std;
#include "golf.h"


int main()
{
	/*初始化*/
	using SALES::Sales;
	using SALES::setSales;
	using SALES::showSales;
	Sales sale1;
	Sales sale2;
	double ar[5] = {43, 45.5, 345, 545, 3};

	/*操作*/
	setSales(sale1, ar, 5);
	setSales(sale2);

	showSales(sale1);
	showSales(sale2);

	cin.get();
	cin.get();
    return 0;
}