Re: Reading Integers

From:

TB <TB@SWEDEN>

Newsgroups:

comp.lang.c++

Date:

Tue, 04 Jul 2006 12:12:56 +0200

Message-ID:

<44aa3ebc$0$27808$88260bb3@news-taz.teranews.com>

Pantheronics skrev:

TB wrote:

Pantheronics skrev:

// file to read
12 13 14
1 1 2 3
1 2 3 1
;

/// The source file

#include <iostream>
#include <fstream>
#include <cstdio>
#include <cstring>
#include <cctype>

using namespace std;

int main()
{
    ifstream fp;
    ifstream fpusage;
    char c;
    char newChar[200];
    int lines = 0;

    fp.open("en.txt");
    fpusage.open("en2.txt");
    while( fp.getline(newChar,sizeof(newChar)) ){
        int len = strlen(newChar);
        cout << newChar << endl;
    }

    return 0;
}

How to read each integer individally?

#include <fstream>
#include <ostream>
#include <algorithm>
#include <vector>

int main(int argc, char* argv[])
{
   std::ifstream in("en.txt");
   if(in) {
     std::vector<int> v;
     std::copy(std::istream_iterator<int>(in),
               std::istream_iterator<int>(),
               std::back_inserter(v));
     std::copy(v.begin(),
               v.end(),
               std::ostream_iterator<int>(std::cout," "));
   }
   return 0;
}

Well, the complete file that i have to read is like this:
-----------------
1 2 3
4 5 6
;
1 0 0
0 1 0
0 1 1
;
---------------
If I read it through vector<int> it stops at the semi-colon line and
never reads after that... :'(

Here you go, I hope you understand it.

#include <fstream>
#include <ostream>
#include <algorithm>
#include <vector>

int main(int argc, char* argv[])
{
   std::ifstream in("en.txt");
   if(in) {
     std::vector<int> v;
     while(!in.eof()) {
       std::copy(std::istream_iterator<int>(in),
                 std::istream_iterator<int>(),
                 std::back_inserter(v));
       in.clear();
       in.ignore();
     }
     std::copy(v.begin(),
               v.end(),
               std::ostream_iterator<int>(std::cout," "));
   }
   return 0;
}

--
TB @ SWEDEN