Read a record from a file.

something like this : (from the top of my head, not tested !!!)

//open filestream
ifstream if;
if.open("file1.txt");

// read all data into program
string currLine;
vector<string> allLines;

while( !EOF ){
  if.getline(currLine);
  allLines.push_back(currLine);
}

// Now all the lines from the first file are in allLines vector.

// eg. split each line based on spaces.
vector<int> disctances;
vector<long> maxtime;
vector<long> recordtime;


// Parse first line, TODO : do thid for all the lines in allLines
currLine = allLines[0];

// extract ditance
string::const_iterator cit = currLine.begin();
while(*cit != ' '){
 string dist;
 dist += *cit;
 cit++;
}

int distI = atoi(dist.c_str());
distances.push_back(distI);

// extract the other data on the line to, and loop until all lines parsed.


// Do all this for second file too, and check the different vectors against each other.
// keep in mind that you can't sort the vectors, because the first element of the distances vector corresponds to the first
// in the other 2 vectors, etc..

This should get you started, as i almost coded it completely

is it a job for strtok() ?


NAME
       strtok, strtok_r - extract tokens from strings

SYNOPSIS
       #include <string.h>

       char *strtok(char *s, const char *delim);

       char *strtok_r(char *s, const char *delim, char **ptrptr);

DESCRIPTION
       A  `token'  is a nonempty string of characters not occurring in the string delim, followed by \0 or by a character occur-
       ring in delim.

       The strtok() function can be used to parse the string s into tokens. The first call to strtok()  should  have  s  as  its
       first  argument.  Subsequent  calls  should  have the first argument set to NULL. Each call returns a pointer to the next
       token, or NULL when no more tokens are found.

       If a token ends with a delimiter, this delimiting character is overwritten with a \0 and a pointer to the next  character
       is saved for the next call to strtok().  The delimiter string delim may be different for each call.

       The  strtok_r()  function  is a reentrant version of the strtok() function, which instead of using its own static buffer,
       requires a pointer to a user allocated char*. This pointer, the ptrptr parameter, must be the same while parsing the same
       string.

thanks for the replies guys.......but
this is not for me though, it is for a friend who's doing an introduction course to C++.

Nope, I don't think this is a job for strtok().

an example they had in there notes looked like this.

....
ifstream fin;
fin.open("file1.txt");

int value;

while (fin >> value)
{
    //in here they had some calculations.
}
....

Is there a way he can use this type of code to get the field values.

A while loop reading the values like this is not somethig I like but it could work


short count = 0;
int value = 0;
while (fin >> value)
{
  ++count;
  if (count > 3)
    count = 1;
  int distance = 0;
  int maxtime = 0;
  int recordtime = 0;
  switch (count)
 {
  case 1:
  // the value is distance
  distance = value;
  break;
  case 2:
  maxtime = value;
  break;
  case 3:
  recordtime = value;
  }

 // do here what you want with the 3 values
}


AND SO ON y

I assumed windows where int == long (32 bits)
For other os you might consider using long

thanks,

i think int would be more than enough for what they want to do.
and I don't want to give him a too complex program to work with.

I'll test this over the weekend.

cheers

You call it.. or just give me the points :-)

I did it almost like Mafalda,

I just changed it a bit, something like this

while (fin >> val1 >> val2 >> val3)

so I took out the case statement.

Thanks