Computer Science Canada

For loops

Author:

cool dude [ Fri May 05, 2006 6:56 pm ]

Post subject:

For loops

can someone please tell me what the difference is between doing it these 2 ways? because the first way doesn't work and i don't see much of a difference Confused

code:

public class listnums1
{
public static void listnums1(int max){
   int i = 0;
   for (i; i<=max; i++){
   System.out.println("Number: " + i);
   }
}
}

Or the correct way

code:

{
public static void listnums1(int max){
   for (int i = 0; i<=max; i++){
   System.out.println("Number: " + i);
   }
}
}

Author:

Tony [ Fri May 05, 2006 8:14 pm ]

Post subject:

well because it's like

for ( declare local? variable; condition; some operation)

so placing i where variable declaration is expected instead is wrong

I think that

code:

int i = 0;
for (; i<=max; i++){

might work, it should in C Laughing

just be careful about your counter's scope

Author:

rizzix [ Fri May 05, 2006 8:45 pm ]

Post subject:

Re: For loops

cool dude wrote:

code:

public class listnums1
{
public static void listnums1(int max){
   int i = 0;
   for (i; i<=max; i++){
   System.out.println("Number: " + i);
   }
}
}

The first part of the for-loop has to be either an initialization or an assignment. Your code clearly breaks that rule.

Maybe you meant this:

code:

public class listnums1
{
public static void listnums1(int max){
   int i;
   for (i = 0; i<=max; i++){
   System.out.println("Number: " + i);
   }
}
}

Author:	cool dude [ Fri May 05, 2006 8:57 pm ]
Post subject:
so this is one of those pointless rules. i don't really see much of a difference in declaring a variables and then making the counted/for loop with it. thanks for explaining P.S. how would you draw shapes in java?

Author:	[Gandalf] [ Sat May 06, 2006 12:38 am ]
Post subject:
cool dude wrote: P.S. how would you draw shapes in java? You create either an applet or a Frame, JFrame, or some other kind of GUI container, and use the paint() method using the Graphics class.

Author:

rizzix [ Sat May 06, 2006 3:11 pm ]

Post subject:

cool dude wrote:

so this is one of those pointless rules. i don't really see much of a difference in declaring a variables and then making the counted/for loop with it.

It's not really a pointless rule. It is a rule.

If you wish you may also write that snippet as follows:

code:

public class listnums1
{
public static void listnums1(int max){
int i = 0;
for (; i<=max; i++){
System.out.println("Number: " + i);
}
}

See the difference?...

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