CODEWITHSUNDEEP
stringfile-io
user22
user22

Reputation: 117

reading in multiple text files

I have a code: 

`int main() {
 int year;

for (year=1880; year<=2011; year++) {
stringstream ss;
ss << year;

string birth = ss.str();

ifstream yob("yob"birth".txt");
}


}`

I want to read in 130 text files with this for loop, and each text file looks like "yob1880.txt" or "yob1975.txt" etc. I know that that ifstream yob("yob"birth".txt") doesn't work I just wanted to illustrate what I wanted to do. How can I add the string "yob" to string year and string ".txt"?

Thank you

Upvotes: 0

Views: 59

Answers (1)

osandov
osandov

Reputation: 127

Use a stringstream. You can then build a string and call ss.str() on it to retrieve the string. E.g.,

std::stringstream ss;
int n = 5;
ss << "file" << n << ".txt";
std::cout << ss.str() << std::endl;

This will write file5.txt to standard out.

Edit: Just checked the docs, and it looks like std::ifstream takes a C string, not a std::string, so you should call c_str() on the resulting string, e.g.,

std::ifstream file(ss.str().c_str());

Upvotes: 1

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