Extra number when reading in from a file and using substr().

[trevormoon]

Hey guys for some reason I'm getting an extra number when I read data from a file and then try and use substr() on the string I just read in. Any help would be greatly appreciated!

Here's the data from the file I'm reading from:
i 35
i 56
i 69

Here's the output from the program with out the if statement:
i 34 35
i 56 57
i 69 70
terminate called after throwing an instance of 'std::out_of_range'
what(): basic_string::substr: __pos (which is 2) > this->size() (which is 0)
Aborted (core dumped)

Output with the if statement:
i 34 35
i 56 57
i 69 70
70

  #include <iostream>
#include <fstream>
#include <string>
#include <stdio.h>
#include <sstream>

using namespace std;

int string_to_int(string s){
   istringstream instr(s);
   int n;
   instr >> n;
   return n;
}



using namespace std;

int main()
{
  ifstream openFile;
  openFile.open("test.txt");
  string readLine;
  int number = 0;
  char c ;
      while(!openFile.eof())
        {
             getline(openFile, readLine);
              c = (char)readLine[0];
              if(readLine.size() > 0)
              readLine = readLine.substr(2,readLine.size()-2);
              number = string_to_int(readLine);
              //  if(c == 'i')
             //   cout<<"omg its an i"<<endl;
             cout<< c << " " << readLine<< " "<< number + 1 <<endl;


        }
  openFile.close();
}

[MiiNiPaa]

while(!openFile.eof()) This is the problem. You should not loop on eof() unless you know how it is work. eof bit will not set until read operation will attempt to extract past-the-end symbol. So you will try to read one more line than there is in a file. This unexisting string is probably 0 length and attempt to call substring on it fails.
Quick fix:

while(getline(openFile, readLine))   
{
    c = (char)readLine[0];
    //... 

[trevormoon]

Thank you for the help!