Thread: fstream

What I'd really like to be able to do is import data from text files into my programs. I am able to do this on Sun terminals at school, but not with Dev-Bloodshed at home. This is an example of a program that should open a text file and print out the numerical data in it. The text file is attached.

Code:

#include <iostream.h>
#include <math.h>
#include <fstream.h>
#include <iomanip.h>
#include <stdlib.h>

int main()
{
//Variable IDs
double a[100];int i,j,N,his[50]={0};
cout<<"Type in the number of data points"<<endl;
cin>>N;

//Read in data from file3.dat
if(N<=64)
{                                     //Read in data from file3.dat
ifstream source;
source.open("file3.dat");

if(!source)
{cerr<<"Can't open data file."<<endl;
system("PAUSE");
return(1);}

for(i=0;i<N;i++)
{source>>a[i];}
source.close();
}

else
{cerr<<"Too many data points."<<endl;
system("PAUSE");
return (1);}


//Print out data before sorting
int k,colnum=8;
for(j=0;j<N;j=j+colnum)
{k=colnum;
if((j+colnum)>N)
{k=N-j;}
for(i=0;i<k;i++)
{cout<<setw(8)<<a[i+j];}
cout<<endl;}
system("PAUSE");
return 0;}

source.open("file3.dat");

It could be that file isn't located in the same directory as your program, so try using the full path of the filename, like:

"D:\\MyData\\file3.dat"

I put the data file in the same folder where the program file is saved, but it just returns (1) with the "Can' open data file." function that is built into the program.

Don't know. Do you think that I need an additional #include<> statement?

with my computer and compiler, even if its the same directory, i have to put a backslash before it. ie.
"\\textfile.txt"
see if that works for you

What compiler do you use? The backslash didn't work but thanks.

maybe im just being utterly and completely naive, but i see you have file3.DAT in your code, yet your test file is file3.TXT