Still Doesnt Run, Help?!!

This is a program that reads data from a disk and outputs data to the same disk.
The data is:
@2,89#3,*67
$187,3#34,72#123#
*3*7*1#*3,4,8

The program must exclude the symbols & just output the digits with the '#' starting a new line.

Output should be:
289
367
1873
3472
123
371
348

Code:

---

C++

---

#include <fstream>
#include <iostream>
#include <cctype>

using namespace std; //introduces namespace std

char const nwln = '\n';

int main ( )
{
char ch;
ifstream data;
ofstream dataout;
int n;
int sum;
int digit;

data.open ("a.\\data.txt");
if (!data)
{
cout << "ERROR -- Cannot open data.txt for input";
return 1;
}

dataout.open ("a:\\dataout.txt");
if (!dataout)
{
cout << "ERROR -- Cannot open dataout.txt for output";
return 1;
}


data.get(ch);
while (data)
{
digit = 0;
while ((ch != '\n') && data)
{
if (isdigit(ch))
digit = ch - '0';
sum = sum*10 + n;
}
if (ch == '#')
dataout.put(sum);
sum = 0;
}

data.close(); dataout.close();
return 0;
}


The program compiles fine (with no errors), but it doesnt print my output to the output file on the disk. Please help & tell me what I am doing wrong. This is my 1st program assignment so I am not at all experienced in c++. Thanks in advance.

Thank you for using code tags

Why is it that when noobies write the title to their thread, they often make it sound like someone's life depends on their code running? *sigh*

You're not reading in from the file. Do that. And read the forum rules.

sum = sum*10 + n;
Ok, I see trouble up there (whatever you're trying to with it).
I think "sum" and "n" have to be initialized somewhere in the beginning. And that's right, use code tags because I have trouble understanding your nested loop.

What Joshdick already said - you're only reading a single byte from the file. How is it that they give you something like this for a first assignment? Everything must be done with small steps. First of all, isolate the problem. Write a dummy app that takes the data from an array of chars and spits it out onto the screen. Then read in a file and output it to the screen. Then work in your algorithm for omitting data, etc.