stl string 小练习

// 1111.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <string>
#include <iostream>
#include <algorithm>


using namespace std;

string strArray[5] = {"prog.dat","mydir","hello.","oops.tmp","end.dat"};

string TrimSpace(string str)
{

		string::size_type i;

	 	while( (i = str.find(" ")) != string::npos )
	 	{
	 		str.replace(i,1,"");
	 	}

 	string::iterator newEnd = remove(str.begin(),str.end(),‘ ‘);
 	str.erase(newEnd,str.end());

	return str;
}

void ReversPrintWordInLine()
{
	const string delims(" \t,.;");
	string line;
	while(getline(cin,line))
	{
		string::size_type begIdx,endIdx;
		begIdx = line.find_first_not_of(delims);
		while(begIdx != string::npos)
		{
			endIdx = line.find_first_of(delims,begIdx);
			if(endIdx == string::npos)
			{
				endIdx = line.length();
			}
			for(int i = endIdx-1;i >= static_cast<int>(begIdx);--i)
			{
				cout << line[i];
			}
			cout << ‘ ‘;

			begIdx = line.find_first_not_of(delims,endIdx);
		}
		cout << endl;
	}
}

void CreateTmpFilename()
{

	string filename,basename,extname,tmpname;
	const string suffix("tmp");

	for(int i = 0;i < 5;++i)
	{
		string::size_type idx = strArray[i].find(".");
		if(idx == string::npos)
		{
			tmpname = strArray[i]+"."+suffix;
		}else
		{
			basename = strArray[i].substr(0,idx);
			extname = strArray[i].substr(idx+1);
			if(extname.empty())
			{
				tmpname = strArray[i];
				tmpname += suffix;
			}else if(extname == suffix)
			{
				tmpname = strArray[i];
				tmpname.replace(idx+1,extname.size(),"xxx");
			}else
			{
				tmpname = strArray[i];
				tmpname.replace(idx+1,suffix.size(),suffix);
			}
		}

		cout << strArray[i] << " ==> " << tmpname << endl;
	}
	cout << endl;
}


int _tmain(int argc, _TCHAR* argv[])
{
	string str = TrimSpace(" sdfsf sdfs sdf ");
	cout << "remove space " << str << endl << endl;

	CreateTmpFilename();


	ReversPrintWordInLine();


	return 0;
}