c++单词转换程序

c++primer 第十二章的单词转换程序运行后出现debug




c++primer 第十二章的单词转换程序运行后出现debug






// 单词转换.cpp
#include<iostream>
#include<map>
#include<fstream>
#include<sstream>
#include<string>

using namespace std;

ifstream& open_file(ifstream& in,const string&file);



int main(int argc ,char **argv)
{
map<string,string> trans_map;
string key,value;
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");
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>::const_iterator map_it=trans_map.find(word);
if(map_it!=trans_map.end())
word=map_it->second;
if(firstword)
firstword=false;
else
cout<<" ";
cout<<word;

}
cout<<endl;

}
return 0;
}

ifstream& open_file(ifstream& in,const string&file)
{
in.close();
in.open(file.c_str());
return in;

}