c++ add word to file if its not there

Question

I am making an application to add data but I am trying to add a data check that checks if the specific data being added already exists then it wont add to the file. Here is what I have but so far its not working, no errors but it just adds the data that already exists:

void checklog(const std::string& input){
    ifstream iFile("C:\\Users\\Seann\\Documents\\storedData\\data.txt");
    string line;
    while(getline(iFile, line)){
        if(input!=line){
        iFile.close();
        updateLog(input);}
    }
}

Thanks in advance to any serious answers.

Answer 1

Your if ... else attempt still makes its decision at the first line it reads, and not loop until you found the word. Try this:

void checklog(const std::string& input){
    ifstream iFile("data.txt");
    string line;
    bool found = false; 
    while (!found && getline(iFile, line)){
        if (input == line)
            found = true;
    }
    iFile.close();
    if (found)
        updateLog(input);
}