4.9

/*
*C++ PRIMER 10.3.9
*/

#include <fstream>
using namespace std;
ifstream& open_file( ifstream &in, const string &file)
{
in.close();
in.clear();
in.open(file.c_str());
return in;
}

#include <iostream>
#include <vector>
#include <string>
#include <utility>
#include <map>
#include <sstream>
#include "open_file.h"

using namespace std;

int main(int argc, char *argv[])
{
if(argc != 3)
throw runtime_error("wrong number of arguments");

ifstream map_file;

if(!open_file(map_file,argv[1]))
throw runtime_error("no transformation file");

string key, value;
map<string,string> trans_map;

while(map_file >> key >> value)
{
trans_map.insert(make_pair(key,value));
}

ifstream input;

if(!open_file(input,argv[2]))
throw runtime_error("no input file");

string line;

while(getline(input,line))
{
istringstream stream(line);
string word;
bool firstword = true;

while(stream >> word)
{
map<string,string>::iterator iter = trans_map.find(word);

if(iter != trans_map.end())
{
word = iter -> second;
}

if(firstword)
{
firstword = false;
}
else
cout << ' ';

cout << word;
}

cout << endl;
}

system("pause");
return 0;
}