Finding number in string

Would there be an easier way to find and print out one number from a string without knowing the number?
For example the fifth number.

Code:

#include <iostream>
#include <string>

using namespace std;

int main()
{
          string port1;
          size_t found;
          int port1int;

          string ftpmessage = " (66,220,9,50,27,99).";
          
          found  = ftpmessage.find(",");
          found  = ftpmessage.find(",",found+1);
          found  = ftpmessage.find(",",found+1);
          found  = ftpmessage.find(",",found+1);

          for(int i=1; i<4; i++)
          {
              port1 = ftpmessage.substr(found+1,i);
              if (port1.find(",") != string::npos) break;

          }
          cout << "port1: " << port1 << endl;

          return 0;

}

Is it possible that by "without knowing the number" you really mean "with the number in a variable"? If so, there are such things as loops, for when you want to repeat something a certain number of times.

Thank you Tabstop!

Im sorry i meant the number after the fourth comma.

So i guess i should put this in a loop:

Code:

 found  = ftpmessage.find(",");
          found  = ftpmessage.find(",",found+1);
          found  = ftpmessage.find(",",found+1);
          found  = ftpmessage.find(",",found+1);

I was thinking about a function that finds the fourth comma and gives back its position
or the characters after it, that would save the place for a loop.

If it's always the fifth number (== after the fourth comma) then I'm not sure you have a question, since that's what you started with.

Anyway, as a suggestion, because I've been in a stringstream frame of mind for the last little while, why not use a stringstream? You can initialize your stringstream with the string you've got, and peel off numbers with >> until you get to the one you want. (You'll either have to read the comma, or there's probably some magic you can do to make >> think (at least temporarily) that comma is a whitespace character so it will automatically separate and be removed.)

Good idea! Thanks!

Originally Posted by tabstop

(You'll either have to read the comma, or there's probably some magic you can do to make >> think (at least temporarily) that comma is a whitespace character so it will automatically separate and be removed.)

I wrote this token matching manipulator that could be used for such purposes.

Thank you Laserlight, i look into it.