Simplifying Code

[Myst1caL]

Sorry to post again today, I tried searching the forums for a similar issue but couldn't find a thread..

Right now I'm learning the switch case (lesson 5 ) and instead of repeatedly using case statements like this:

switch(example)
{ 
case 1:

break;

case 2:

break;

case 3:

break;


...etc

}

I'm trying to use a loop for simplifying this code, but it's not working out well..
My initial question is, can we even use loops with case?

This is an attempt:

printf("Enter a number less than 10:");
scanf("%d\n", &tester);

if(tester >= 10)
{
    printf("Learn to follow instructions!");
}

else
{
    switch(tester)
     {
        for (j=0;j<10;j++) //error 1
          {
                case j: //error 2
                printf("This number is a +%d reference from 0", j);
                break;
          }

     }
}

it's not the best style and its probably sloppy(like I dont even have a default case), but i'm just trying to learn the concept for simplifying the code

I get 2 errors:
1. unreachable code at beginning of switch statement
2. case label does not reduce to an integer constant

any suggestions would be nice

[Dave_Sinkula]

Why do you have the switch at all?

[Myst1caL]

well it's not really necessary in this case but i'm just trying to learn it

I made my own example (pretty much any example) just so I can use it

[Dave_Sinkula]

From here:

An important thing to note about the switch statement is that the case values may only be constant integral expressions. Sadly, it isn't legal to use case like this:

If it's showing that something won't work, don't copy it and expect it to work.

[edit]And I have no idea what you expect a loop to help with.
[edit=2]Oh, wait. I think I see. No you can't do that.

[Myst1caL]

From here:
If it's showing that something won't work, don't copy it and expect it to work.

[edit]And I have no idea what you expect a loop to help with.
[edit=2]Oh, wait. I think I see. No you can't do that.

so if I ever needed case, I can never use a loop to run through cases?

[Dave_Sinkula]

You can use a switch in a loop, yes. You can't create a "loop" of "cases".

What you are trying to invent, methinks, is an if statement.

[edit]That is, what I think you are implying by this:

      switch ( var )
      {
         for ( i = 1; i < 5; ++i )
         {
            case i:
               foo();
               break;
         }
      }

Is implemented like this.

      if ( var >= 1 && var <= 5 )
      {
         foo();
      }

[Myst1caL]

You can use a switch in a loop, yes. You can't create a "loop" of "cases".

What you are trying to invent, methinks, is an if statement.

[edit]That is, what I think you are implying by this:

      switch ( var )
      {
         for ( i = 1; i < 5; ++i )
         {
            case i:
               foo();
               break;
         }
      }

Is implemented like this.

      if ( var >= 1 && var <= 5 )
      {
         foo();
      }

yeah, that makes things much easier then, thanks! ^^