Get file info into variables?

Question

What is the best way to get this info from a file for each line?

the text file looks like this

1 E  
1 P  
1 C  
2 E a  
5 E P C

So i need to get the info from line 1(1 E) put 1 into a variable and then E into another. The same for the rest of the lines, but some have a different number of elements which I dont understand how to do.

Answer 1

You'll probably need a vector of vectors.

std::vector<std::vector<std::string> > info;

The inner vector contains each word in a line

The outer vector contains each line.

Read each line in the file, tokenise the line, add each token to the inner vector, add the vector for the words to the vector for each line

Sounds like a homework question so I'm not going to post the code showing how to read a file, or tokenise the string

Answer 2

You can use filestream >> intvariable; to read the integer at the beginning of the line. You can then use getline to read the rest of the line into a string and then maybe split that into an array or do whatever else you want to do with it. You weren't very specific as to what exactly you want to do.

Answer 3

A quick/dirty solution.

#include <fstream>
#include <vector>
#include <string>
#include <sstream>

int main()
{
    using namespace std;

    typedef pair<size_t, vector<string> > infoPair;
    typedef vector<infoPair > infoVector;

    ifstream inputFile("test.txt");
    size_t lineNumber = 1;
    infoVector info;
    string line;

    while(getline(inputFile, line))
    {
     stringstream extractor(line);
     vector<string> symbols;
     string symbol;

     while(extractor >> symbol)
     {
      symbols.push_back(symbol);
     }

     info.push_back(infoPair(lineNumber, symbols));
     lineNumber++;
    }

    return 0;
}