data files

[bluegenep]

Hey Guys i need your input here..
I created a data file example.dat which looks like:

34 12 14
23 23 54
2 32 67
1 56 7
12 2 67

Then i created a program that extracts the data from the example.dat file and prints in the output as a matrix.. I wrote a program for that and all i get in an endless loop of 67 over and over again
Here is my program code

#include <iostream>
using std::cerr;
using std::cout;
using std::endl;

#include <fstream>
using std::ifstream;

#include <cstdlib> // for exit function

int i, j,A[5][3];

int main()
{
	ifstream indata; // indata is like cin
	int num; // variable for input value
	
	indata.open("example.dat"); // opens the file
	if(!indata) { // file couldn't be opened
		cerr << "Error: file could not be opened" << endl;
		exit(1);
	}
	
	indata >> num;
 	i= 1;j=1;
	while ( !indata.eof() ) { // keep reading until end-of-file
		
		indata >> num; // sets EOF flag if no value found
		
		for (i=1; i<=3; i++) {
			for (j=1; j<=5; j++) {
				A[i][j]=num;
			}
		}
		
		
	}
	indata.close();
	cout << "End-of-file reached.." << endl;
	for (i=1 ;i=3; i++)
	{
		for (j=1;j=3; j++)
		{cout <<A[i][j]<<"   ";}
		cout <<endl;};
	
	return 0;
}

Any Inputs are highly appreciated!

[roberts]

Since the input file is tightly structured, you could loop through the rows of the matrix and read into the cells directly using something similar to:

indata >> A[i][0] >> A[i][1] >> A[i][2];

Where i is your loop variable bounded by the number of rows in your matrix.

[bluegenep]

I wanted in A[i][j] because later i want to work with bigger matrix depending on the situation.
Thanks!

[roberts]

Here:

	for (i=1 ;i=3; i++)
	{
		for (j=1;j=3; j++)
		{
                       cout <<A[i][j]<<"   ";
                }
		cout <<endl;
        };
 

the for loop is structured:

for( initialization; condition; increment)

you're setting i = 1 in the initialization, then setting i = 3 in the conditional and doing the same for the j loop. So it's printing out:

34 12 14
23 23 54
2 32 67 <---- this last column value.
1 56 7
12 2 67

for each printing.

Sorry, I didn't read your original post all the way through. I think I ate something spoiled and have been taking frequent emergency leaves from the keyboard.