Read value from a file and store them in array

[projectUser]

I have this text file which contains values of 1s and 0s only. I need to separate the 1s and 0s and store them in an array.

// My initial solution

file3.open( "read.txt", fstream::out | fstream::in );

int Ones[];// all ones here 
int Zeros[];// and all zeros here

while( !file3.eof() )
{
  //if value from file is 1 store it in Ones[]
  //else store it in Zeros[]
}

The problem is I don't know what size to give to the array since I'm reading from the file.

Any suggestions?

[j2NvC542]

If you don't know what size you want the array to be, use a vector instead. It is dynamic and you can push_back() values easily into it.

http://www.cplusplus.com/reference/stl/vector/

[projectUser]

thanks I already got it :)

[jtm]

Hi,
projectuser could you please tell me how you did it?
i also want to extract some values from a file and then use only a value at
a specific position.
Here is what i did so far:

char str[] ="E0210|05|87785781|000000000000|0|5359245001069019|Do not honour|||1106|20||20120806092539|710|||MASTER CARD HOLDER /||||||"; //this is what i get from the file
char * pch;
int i;

pch = strtok (str,"|");
i=1;// im using this so that it controls the number of time the loop iterates

while (pch != NULL)
{

pch = strtok (NULL, "|");
i++;
if(i==7)//i break the loop here because i actually need this field
//it is a message that i return to the User and this message will always be between the 6th and the 7th | symbol
//ist there a way to specify it directly? please note that i cannot use the length or the position because it is not fix.
{
Application->MessageBoxA(pch,NULL,NULL) ;
break;
}
}
The problem with the code above is that the loop does not even get in my if statement sometimes it just exits.
Thank you

[projectUser]

vector<int> zero;
int num

while( file3 >> num )
{
  if(num == 1)
    zero.push_back(num);
}