If file exist, work with it, if no, create it

Question

fstream datoteka;
datoteka.open(\"Informacije.txt\",  fstream::in | fstream::out | fstream::app);

if(!datoteka.is_open()){              
    ifstream datoteka(\"Inf         


        

Answer 1

If filename does not exist, the file is created. Otherwise, the fstream::app, If file filename already exists, append the data to the file instead of overwriting it.

int writeOnfile (char* filetext) {
       ofstream myfile;
       myfile.open ("checkSellExit_file_output.csv", fstream::app);
       myfile << filetext;
       myfile.close();
       return 0;
    }