initialising an array

[little_polarbear]

Hello,
i have the problem, that i have to read in lines from a text document into an array. I know how to write it, but my main problem is, that one line says 1*0 and so i don't know how i have to initialise the array. It can't be private int array so what do I have to use... it would be lovely if someone could help me

thank you so much

little_polarbear

[xcallmejudasx]

I'm a little confused to what you mean. You say you know how to write it so can you post some pseudo code at least so we can get a better idea?

The line that says 1*0 needs to be calculated and read in as just 0? If that's the case you can just noob your way out and put an if statement that checks if the string is "1*0" and change it to just 0, or you could look up a string to int converter method(I am unaware of any off the top of my head) so it would work for multiple occasions like this one.

[little_polarbear]

oh no... sry... it is not a calculation... I have to write somethinh with MinTerms... really confusing... this is the code...

import java.io.*;
import java.util.Vector;
public class Implikanten
{

private Vector Q[];
public int n;
private int array[];

public void reading(String fileName)
throws FileNotFoundException, NullPointerException
{
String line = null;
int n = 0;
int track = 0;

BufferedReader in = new BufferedReader(new FileReader(fileName));

try
{
while((line = in.readLine()) != null)
{
if(track == 0)
{
n = Integer.parseInt(line);
array = new array[n];

}
else
{
array[track - 1] = array.valueOf(line.trim());
}
if(track == n+)
{
break;
}
track++;
}
}
catch (IOException e)
{
System.out.println("Error in reading file");
}

for(int i = 0; i <= Q.length; i++)
{
System.out.println(array[i]);
}
}

public static void main(String[] args)
throws FileNotFoundException
{
Implikanten app = new Implikanten();
app.reading("fileName");
}




}


and it is saying that i have to save the MinTerms in the array Q so that if I have for example 100 it must be in Q[2] because it contains 2 zeros, if it has one zero, it must be in Q[1] the * just means, that there is no number... what i wanted to do is read in the terms into an normal array and then put them from there into the Vector Q but i think that there is another way which is more simple, so that i can put it directly into the array Q, but i don't know exactly how to do it... i tried it and this is my code, which followes:

import java.io.*;
import java.util.Vector;
public class Implikanten
{

private Vector Q[];
public int n;

public void reading(String fileName)
throws FileNotFoundException, NullPointerException
{
String line = null;
int n = 0;
int track = 0;

BufferedReader in = new BufferedReader(new FileReader(fileName));

try
{
while((line = in.readLine()) != null)
{
if(track == 0)
{
n = Integer.parseInt(line);
Q = new Vector[n];

}
else
{
Q[track - 1] = Vector.valueOf(line.trim());
}
if(track == n+)
{
break;
}
track++;
}
}
catch (IOException e)
{
System.out.println("Error in reading file");
}

for(int i = 0; i <= Q.length; i++)
{
System.out.println(Q[i]);
}
}

public static void main(String[] args)
throws FileNotFoundException
{
Implikanten app = new Implikanten();
app.reading("fileName");
}




}


little_polarbear

[ianjedi]

toArray() populate a static array with the contents of a Vector? or is that to simple.

cheers

ian J

[xcallmejudasx]

oh no... sry... it is not a calculation... I have to write somethinh with MinTerms... really confusing... this is the code...

import java.io.*;
import java.util.Vector;
public class Implikanten 
{
	
private Vector Q[];
public int n;
private int array[];

	public void reading(String fileName) 
	throws FileNotFoundException, NullPointerException
	{
		String line = null;
		int n = 0;
		int track = 0;
		
		BufferedReader in = new BufferedReader(new FileReader(fileName));
		
		try
		{
			while((line = in.readLine()) != null)
			{
				if(track == 0)
				{
					n = Integer.parseInt(line);
					array = new array[n];
					
				}
				else
        		{
        			array[track - 1] = array.valueOf(line.trim());
        		}
				if(track == n+)
				{
					break;
				}
				track++;
			}
		}
		catch (IOException e)
		{
			System.out.println("Error in reading file");
		}
		
		for(int i = 0; i <= Q.length; i++)
		{
			System.out.println(array[i]);
		}
}
	
	public static void main(String[] args) 
	throws FileNotFoundException
	{
		Implikanten app = new Implikanten();
		app.reading("fileName");
	}




}

and it is saying that i have to save the MinTerms in the array Q so that if I have for example 100 it must be in Q[2] because it contains 2 zeros, if it has one zero, it must be in Q[1] the * just means, that there is no number... what i wanted to do is read in the terms into an normal array and then put them from there into the Vector Q but i think that there is another way which is more simple, so that i can put it directly into the array Q, but i don't know exactly how to do it... i tried it and this is my code, which followes:

import java.io.*;
import java.util.Vector;
public class Implikanten 
{
	
private Vector Q[];
public int n;

	public void reading(String fileName) 
	throws FileNotFoundException, NullPointerException
	{
		String line = null;
		int n = 0;
		int track = 0;
		
		BufferedReader in = new BufferedReader(new FileReader(fileName));
		
		try
		{
			while((line = in.readLine()) != null)
			{
				if(track == 0)
				{
					n = Integer.parseInt(line);
					Q = new Vector[n];
					
				}
				else
        		{
        			Q[track - 1] = Vector.valueOf(line.trim());
        		}
				if(track == n+)
				{
					break;
				}
				track++;
			}
		}
		catch (IOException e)
		{
			System.out.println("Error in reading file");
		}
		
		for(int i = 0; i <= Q.length; i++)
		{
			System.out.println(Q[i]);
		}
}
	
	public static void main(String[] args) 
	throws FileNotFoundException
	{
		Implikanten app = new Implikanten();
		app.reading("fileName");
	}




}

little_polarbear

Just made your response a little easier to read. Did you copy paste your code exactly from a text document or an IDE? I ask this because of

if(track == n+)

is there supposed to a digit after that or are you just incrementing it?

also

	Q[track - 1] = Vector.valueOf(line.trim());

is supposed to take the value of the line after you parse it. So

Q[track - 1] = Vector.valueOf(Integer.parseInt(line.trim()));

or some sort of numeric value. I havn't worked with Vector but common sense tells me i can't use a String type and get a valueOf unless it has been parsed to something numeric.

[little_polarbear]

Hey Ian,
just one question, if i wanna put the vector into an array, i first have to read in the values from the document, haven't I.... but I wanna have all the values which contains two zeros in Q[2] and the values which contains one zero in Q[1] and this method wouldn't do it... id i understood it right... or do i understand it wrong...

little_polarbear

[ianjedi]

Hey Ian,
just one question, if i wanna put the vector into an array, i first have to read in the values from the document, haven't I.... but I wanna have all the values which contains two zeros in Q[2] and the values which contains one zero in Q[1] and this method wouldn't do it... id i understood it right... or do i understand it wrong...

little_polarbear

No not all of that :) you would need to break it down into steps, I am not sure what part you need help with.

cheers

ian J

[little_polarbear]

ok, i kind of managed to read it into an array, the one problem is, that I don't know, how i have to initialisise my array, because i am always getting an error message, that * is not an integer... so i now have an array with
array[0] = 100
array[1] = 001
array[2] = 1*0

the star doesn't mean times, just that there is no number... and now i have to put it into the vector Q[] and here i don't know how to do do it... because i have to count the zeros in this array and then put it into the right position at Q[] can i do it by the way with the methos AddMinterm()

little_polarbear

[emceenugget]

could you give us the exact error message(s) and what line(s) they indicate?

[little_polarbear]

ok, I just put the code down again... and under it the error message

import java.io.*;
import java.util.Vector;
public class Implikanten
{

private Vector Q[];
public int n;
private int array[];

public void AddMinterm(int n, String s)
{

}


public void reading(String fileName)
throws FileNotFoundException, NullPointerException
{
String line = null;
int n = 0;
int track = 0;

BufferedReader in = new BufferedReader(new FileReader(fileName));

try
{
while((line = in.readLine()) != null)
{
if(track == 0)
{
n = Integer.parseInt(line);
Q = new Vector[n];

}
else
{
Q[track - 1] = Vector.valueOf(Integer.parseInt(line.trim()));
}
if(track == n)
{
break;
}
track++;
}
}
catch (IOException e)
{
System.out.println("Error in reading file");
}

for(int i = 0; i <= Q.length; i++)
{
System.out.println(Q[i]);
}
}

public void Ausgeben()
{

}

public static void main(String[] args)
throws FileNotFoundException
{
Implikanten app = new Implikanten();
app.reading("fileName");
}




}


and here is the error message:

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
The method valueOf(int) is undefined for the type Vector

at Implikanten.reading(Implikanten.java:41)
at Implikanten.main(Implikanten.java:70)


hope that it is helping you... thank you so much for all your help


little_polarbear

[Nakira]

Maybe im just being a noob here, if i am then im sorry, but try:

import java.lang.*;

Sorry if that doesn't help.

[little_polarbear]

thank you, i tried it, but it doesn't really help, but still thank you so much :-)

little_polarbear

[emceenugget]

java.lang.* is imported by default and doesn't have to explicitly be stated.

The error is telling you that the class Vector has no method "valueOf" that takes in type int as a parameter.

[Fubarable]

Maybe im just being a noob here, if i am then im sorry, but try:

import java.lang.*;

Sorry if that doesn't help.

I don't think that you ever have to import java.lang.* that this is automatically imported. Do you have a reference that suggests otherwise? If so, please share it with us.

[ianjedi]

Exception in thread "main" java.lang.Error: Unresolved compilation problem:
The method valueOf(int) is undefined for the type Vector

should be I think ? Q[track - 1] = Integer.valueOf(Integer.parseInt(line.trim()));


I think its expecting a String at valueOf and you are passing an int into the vector.

thanks

Ian J

[Norm]

method valueOf(int) is undefined for the type Vector

at Implikanten.reading(Implikanten.java:41)

What code is at line 41 in Implikanten.java?