why does this have infinite loop?

[jimgym1989]

import java.io.*;
import java.util.*;
import java.lang.*;
public class ArrayNo9 {
 
 static Scanner console = new Scanner(System.in);
    public static void main(String[]args) {
 
     int[][] inStock = new int[10][4];
     //inStock[0] = new int[10];
     int[] alpha = new int[20];
     int[] beta = new int[20];
     int[] gamma = {11,13,15,17};
     int[] delta = {3,5,2,6,10,9,7,11,1,8};
 copyGama(inStock,gamma);
}
public static void copyGama(int[][]a,int[]b)
    {
     int index,c,i;
     System.out.printf("\nTry: ");
     for(i = 0;i<a.length;i++)
     {
     for(c = 0;c<b.length;c++)
     {
         a[i][c] = b[c];
         System.out.printf("%3d",a[i][c]);
 
     if(i==9){
     System.out.print("\n");
     }
     }
     }
}
 
 

it makes my computer hang up because of its infinite loop..

[Nepomuk]

It doesn't have an infinite loop. It's not very Java-like coding (do you come from a C background by any chance?), but it works. I get the following output:

Try:  11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11
 13
 15
 17

There might be an infinite loop somewhere else, but this code works fine.

A few tips:

1. You don't have to import java.lang, it's automatically imported.
2. For such tasks, you normally don't use printf in Java, but just print.
3. You don't have to declare your variables at the beginning of a method, indeed you should give them the smallest possible scope:
   

   for(int i = 0; i < a.length; i++)
   {
       for(int c = 0; c < b.length; c++)
       {
           //...
       }
   }

Greetings,
Nepomuk

[jimgym1989]

It doesn't have an infinite loop. It's not very Java-like coding (do you come from a C background by any chance?), but it works. I get the following output:

Try:  11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11 13 15 17 11
 13
 15
 17

There might be an infinite loop somewhere else, but this code works fine.

A few tips:

1. You don't have to import java.lang, it's automatically imported.
2. For such tasks, you normally don't use printf in Java, but just print.
3. You don't have to declare your variables at the beginning of a method, indeed you should give them the smallest possible scope:
   

   for(int i = 0; i < a.length; i++)
   {
       for(int c = 0; c < b.length; c++)
       {
           //...
       }
   }

Greetings,
Nepomuk

tnx nepomuk!! i know get it..hehehe
but printf works on java.. :-)

[Nepomuk]

but printf works on java.. :-)

Well, it works (since Java 1.5), but it's a bit... well... the word "overkill" comes to mind. :-D

You may want to check the PrintStream Documentation (as System.out is a PrintStream), just to see what the best option may be. Java is traditionally more like C++ in this issue (and many others too) - instead of using something like

double pi = 3.14;
System.out.printf("pi is approx. &d\n", pi);

you normally use something like this:

double pi = 3.14;
System.out.print("pi is approx. " + pi + "\n");

or even

double pi = 3.14;
System.out.println("pi is approx. " + pi);

I find the latter easier (especially when the printouts get long), but of course, as long as you're using JRE1.5 or newer, it's your choice entirely. ^^

Greetings,
Nepomuk