2-D array help

[DMarsh12]

I have a project due thursday and it involves creating a 2d array that displays the output

123
456
789

Here is what i have so far...

public class twodarray {

public static void main(String[] args) {
int [][]T={{1,2,3},{4,5,6},{7,8,9}};
list (T);

public class list (int[]x)
{
for (int R=0; R<3;R++)
for (int C=0; C<3;C++)
System.out.print(x[R][C] + " ");


}
}

}

i also have to make arrays such as just

blank blank blank
blank 5 blank
blank blank blank

but it appears that that has to do with changing list to left diag or right diag but i can't seem to display the list...

what am i doing wrong?
thanks in advance

[sunde887]

There is all sorts wrong with that. I don't believe you meant to make list a class, it should be a static method for now.

change

public class list(int[]x)

to

public static void list(int[]x)

Other than that the code seems fine.

[DMarsh12]

There is all sorts wrong with that. I don't believe you meant to make list a class, it should be a static method for now.

change

public class list(int[]x)

to

public static void list(int[]x)

Other than that the code seems fine.

i did that and it got rid of a few errors but replaced them with new ones...

F:\Java CSCL-120-W01-Programming\Project\Project3.java:17: illegal start of expression
public static void list(int[]x)
^
F:\Java CSCL-120-W01-Programming\Project\Project3.java:17: illegal start of expression
public static void list(int[]x)
^
F:\Java CSCL-120-W01-Programming\Project\Project3.java:17: ';' expected
public static void list(int[]x)
^
F:\Java CSCL-120-W01-Programming\Project\Project3.java:17: '.class' expected
public static void list(int[]x)
^
F:\Java CSCL-120-W01-Programming\Project\Project3.java:17: ';' expected
public static void list(int[]x)
^
5 errors

i don't get it :confused:

[sunde887]

You are declaring the method inside main, use a closing curly brace to end main before writing list.

[DMarsh12]

There is all sorts wrong with that. I don't believe you meant to make list a class, it should be a static method for now.

change

public class list(int[]x)

to

public static void list(int[]x)

Other than that the code seems fine.

You are declaring the method inside main, use a closing curly brace to end main before writing list.

ok so i think this is what you meant...

public class twodarray {


public static void main(String[] args) {
int [][]T={{1,2,3},{4,5,6},{7,8,9}};
}
list (T);


public static void list (int[]x)
{
for (int R=0; R<3;R++)
for (int C=0; C<3;C++)
System.out.print(x[R][C] + " ");


}
}

and it did help a lot i am down to just two errors...

F:\Java CSCL-120-W01-Programming\Project\Project3.java:16: invalid method declaration; return type required
list (T);
^
F:\Java CSCL-120-W01-Programming\Project\Project3.java:16: <identifier> expected
list (T);

thank you so much already guys i really do appreciate this

[sunde887]

Everything you want done should be inside the main method(method calls, etc)
There are special circumstances but only instance variables should be outside of methods. Add the call to list to main.

[DMarsh12]

Everything you want done should be inside the main method(method calls, etc)
There are special circumstances but only instance variables should be outside of methods. Add the call to list to main.

i'm sorry i dont understand what you mean...i am very new to java i don't know why this was assigned to such a novice group but do you think you could elaborate a little more? thanks in advance

[DMarsh12]

ok i understand what you meant now but the output is giving me
1
2
3
4
5
6
7
8
9

why is this so?

[sunde887]

Haha, I can tell you are a novice, but that's fine, I hope you understand what I meant. Your loop currently is using println, which puts the string data on console and then adds a new line character. You will need to use System.out.println and System.out.print. Try to figure out which one goes where.

Although you can't tell, this is actually a very good exercise for a novice. It demonstrated the use of loops, nested loops, arrays, and the difference between print and println.

[ranjiths]

ok i understand what you meant now but the output is giving me
1
2
3
4
5
6
7
8
9

why is this so?

Modify your code snippet to the following.


for (int R=0; R<3;R++)
{
for (int C=0; C<3;C++)
System.out.print(x[R][C] + " ");
System.out.println();
}

The additional System.out.println command is to take the cursor position to the next line after printing every three numbers.

Any more help needed?

- Ranjith

[goldest]

Ranjith,

Use Code Tags while posting your code hence forth.

Goldest

[DarrylBurke]

Ranjith,

Use Code Tags while posting your code hence forth.

Goldest

Better still, don't post it. Ranjith has already been reported for several poor responses and oversize signature.

db

[goldest]

Better still, don't post it. Ranjith has already been reported for several poor responses and oversize signature.

db

OOPS! Thanks for the info though. :D

[DMarsh12]

thank you all very much..it is working fine now i appreciate it

EDIT

i thought id be able to do the second part of the project with the information i have but its not working to his standards...

i am supposed to be able to print out

x x x
x 5 x
x x x where the xs represent blank spaces as well as

x x 3
x 5 x
7 x x

1 x x
x 5 x
x x 9

1 x 3
x x x
7 x 9

please any help is appreciated.

[ranjiths]

Better still, don't post it. Ranjith has already been reported for several poor responses and oversize signature.

db

It is only you who has reported. Rather than giving such responses, try solving the question asked. My response to this message of yours at Hi I am Ranjith Reintroducing myself on this day

[ranjiths]

thank you all very much..it is working fine now i appreciate it

EDIT

i thought id be able to do the second part of the project with the information i have but its not working to his standards...

i am supposed to be able to print out

x x x
x 5 x
x x x where the xs represent blank spaces as well as

x x 3
x 5 x
7 x x

1 x x
x 5 x
x x 9

1 x 3
x x x
7 x 9

please any help is appreciated.

The following will do the work:

int numbers[][]= {{1,2,3},{4,5,6},{7,8,9}};
for(int i=1; i<=4;i++)
{
for(int j=0;j<=2;j++)
{
for(int k=0;k<=2;k++)
{
if  (   (i==1&&j=1&&k==1)  ||   (i==2&&((j==0&&k==2)||(j==1&&k==1)||(j==2&&k==0)))     ||=     (i==3&&((j==0&&k==0)||(j==1&&k==1)||(j==2&&k==2)))    ||(i==4&&((j==0&&k==0)||(j==0&&k==2)||(j==2&&k==0)||(j==2&&k==2))))
System.out.println(numbers[j][k]);
else
System.out.println(" ");

}
}
}

Alternately you can split the four patterns into four programs and write the code for each separately.
Here is the algorithm for each:
For each of the four pattern a nested for iteration is used with variables i and j to refer to the array element. For each iteratiuon the number is printed if the following conditions are satisfied
Pattern 1: i=1 j=1
Pattern 2: i+j=2 and i<=j
Pattern 3: i+j=2 and i>=j
Pattern 4: i+j=2 and i!=j

Here is the code

Pattern 1:

int a[][]= {{1,2,3},{4,5,6},{7,8,9}};
for(int i=0;i<=2;i++)
{
for(int j=0;j<=2;j++)
{
if(i==1&&j==1)
System.out.println(a[i][j]);
else
System.out.println(" ");
}
}

Pattern 2:

int a[][]= {{1,2,3},{4,5,6},{7,8,9}};
for(int i=0;i<=2;i++)
{
for(int j=0;j<=2;j++)
{
if( i+j==2  && i<=j)
System.out.println(a[i][j]);
else
System.out.println(" ");
}
}

Pattern 3:

int a[][]= {{1,2,3},{4,5,6},{7,8,9}};
for(int i=0;i<=2;i++)
{
for(int j=0;j<=2;j++)
{
if( i+j==2  && i>=j)
System.out.println(a[i][j]);
else
System.out.println(" ");
}
}

Pattern 4:

int a[][]= {{1,2,3},{4,5,6},{7,8,9}};
for(int i=0;i<=2;i++)
{
for(int j=0;j<=2;j++)
{
 if(i+j==2  && i!=j)
System.out.println(a[i][j]);
else
System.out.println(" ");
}
}

Hope that your question is solved.
If you have any other doubts please reply.

- Ranjith