combining strings - string

Question

I'm trying to combine strings to input text files. My code looks like this:
`#include <iostream>
#include <sstream>
#include <fstream>
#include <string>
using namespace std;
int main(){
int year;
string line;
string fileName;
for (int i=1880; i<2012; i++){
stringstream ss;
ss << year;
fileName = string("yob") + string(year) + string(".txt");
ifstream ifile(fileName.c_str());
getline(ifile,line);
cout << line << endl;
ifile.close();
}
}`
The text files look like "yob1880.txt" <-- that's the first text file and it goes all the way to "yob2011.txt". I want to input the text files one by one, but combining these three string types doesn't work it gives me an error saying invalid conversion from int to const char*.
Any thoughts on the problem? Thanks!

Answer 1

You should get it from the stringstream. You're almost there but this is what you should do instead:
#include <iostream>
#include <sstream>
#include <fstream>
#include <string>
using namespace std;
int main(){
int year;
string line;
string fileName;
for (int i=1880; i<2012; i++){
year = i; //I'm assuming this is what you meant to use "year" for
stringstream ss;
ss << year; //add int to stringstream
string yearString = ss.str(); //get string from stringstream
fileName = string("yob") + yearString + string(".txt");
ifstream ifile(fileName.c_str());
getline(ifile,line);
cout << line << endl;
ifile.close();
}
}