Question

once again I ask for help. I haven’t coded anything for sometime!

Now I have a text file filled with random gibberish. I already have a basic idea on how I will count the number of occurrences per word.

What really stumps me is how I will determine what line the word is in. Gut instinct tells me to look for the newline character at the end of each line. However I have to do this while going through the text file the first time right? Since if I do it afterwords it will do no good.

I already am getting the words via the following code:

vector<string> words;
string currentWord;

while(!inputFile.eof())
{
inputFile >> currentWord;
words.push_back(currentWord); 
}

This is for a text file with no set structure. Using the above code gives me a nice little(big) vector of words, but it doesn’t give me the line they occur in.

Would I have to get the entire line, then process it into words to make this possible?

Answer 1

Use a std::map<std::string, int> to count the word occurrences — the int is the number of times it exists.

If you need like by line input, use std::getline(std::istream&, std::string&), like this:

std::vector<std::string> lines;
std::ifstream file(...) //Fill in accordingly.
std::string currentLine;
while(std::getline(file, currentLine))
    lines.push_back(currentLine);

You can split a line apart by putting it into an std::istringstream first and then using operator>>. (Alternately, you could cobble up some sort of splitter using std::find and other algorithmic primitaves)

EDIT: This is the same thing as in @dash-tom-bang’s answer, but modified to be correct with respect to error handing:

vector<string> words;
int currentLine = 1; // or 0, however you wish to count...

string line;
while (getline(inputFile, line))
{
   istringstream inputString(line);
   string word;
   while (inputString >> word)
      words.push_back(pair(word, currentLine));
}