How Do I Open A txt File Without It Erasing The Previous Content

Question

So I want to be able to open up the file after the console closes and be able to continue adding to the file.

int main(){
    string inputWord;
    ofstream theFile("Info.txt");
    cout << "Type Word or Sentence: ";

    while(getline(cin,inputWord)){
        cout << "Type Word or Sentence: ";
        theFile << "Word or Sentence: " << inputWord;
        theFile << "(Regular Value): " << ch2n(inputWord) << endl;
        theFile << "(Other Value): " << char2num(inputWord) << endl;
        theFile << "(Sum): " << ch2n(inputWord) + char2num(inputWord) << endl;
        theFile << "(Difference): " << ch2n(inputWord) - char2num(inputWord) << endl;
        theFile << "(Total): " << ch2n(inputWord) + (ch2n(inputWord)+char2num(inputWord)) + (ch2n(inputWord)-char2num(inputWord)) + char2num(inputWord) << endl << endl;

        if(inputWord == "")return 0;
    }
}

Here is a reference to [ios_base: openmodes](http://www.cplusplus.com/reference/ios/ios_base/openmode/) — James, Jan 17 '14 at 03:23

score 5 · Accepted Answer · answered Jan 17 '14 at 02:56

5

You have to open the file stream in append mode:

std::ofstream out("Info.txt", std::ios_base::app);
//                            ^^^^^^^^^^^^^^^^^^

answered Jan 17 '14 at 02:56

David G

94,763
41
167
253

score 0 · Answer 2 · answered Jan 17 '14 at 03:58

http://www.cplusplus.com/reference/fstream/fstream/open/

at here there is an example also.

// fstream::open / fstream::close
#include <fstream>      // std::fstream

int main () {

  std::fstream fs;
  fs.open ("test.txt", std::fstream::in | std::fstream::out | std::fstream::app);

  fs << " more lorem ipsum";

  fs.close();

  return 0;
}

How Do I Open A txt File Without It Erasing The Previous Content

2 Answers2

Linked