Re: Is this code to find an int in a string okay ?

From:
"Victor Bazarov" <v.Abazarov@comAcast.net>
Newsgroups:
comp.lang.c++
Date:
Thu, 6 Dec 2007 17:50:53 -0500
Message-ID:
<fj9uce$q2a$1@news.datemas.de>
Jim Langston wrote:

"Diwa" <shettydiwakar@gmail.com> wrote in message
news:85ec7280-977f-4651-a3f4-2199b4150d10@j44g2000hsj.googlegroups.com...

Hi Guys,

Is there any better way than below to find an int in a string (e.g.
"30" in "KFStat30A")

// --------------------------------------------------------------
#include <iostream>
#include <sstream>
#include <vector>

using namespace std;

int main()
{
 vector<string> strs ;
 strs.push_back("KFStat30A");
 strs.push_back("KFStat2A");
 strs.push_back("555555");
 strs.push_back("KKKKKK");
 strs.push_back("KKKK555");

 std::string str;

 for (int i=0; i<strs.size(); i++)
 {
    str = "";

    int beg = strs[i].find_first_of("0123456789");

    if (beg != string::npos)
    {
      int end = strs[i].find_first_not_of("0123456789", beg);
      str.assign(strs[i], beg, end-beg);
    }

    cout << strs[i] << " " << str << "\n";
 }
 return 0;
}


This code looks okay. Although I wonder what you would want with a
string such as
"KFStat30A02". Your code could be described as finding the first
continuous number in a string. I really don't think you can simply
if too much though from what you already have, other than making it a
function returning a std::string.


I would probably add the ability to extract the substring as a number
in a given base. E.g., "KFStat30A02" in base 10 would yield "30" and
in base 16 would yield "F"... :-) Or make it smarter and able to
recognize the 'x' or 'X' after the leading 0...

V
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