Label control doubt??

[Joe Harry]

The code below is from here

 
class A{
  public static void main(String args[]){
    int h = 0, i = 0, j = 0, k = 0;
 
    label1:
    for(;;) {
      h++;
 
      label2:
      do{
        i++;
        k = h + i + j;
        switch(k){
          default: break label1;
          case1: break label1;
          case2: break;
          case3: break label2;
          case4: continue label2;
          case5: continue label1;
        }
      }while(++j<5)
    }
    system.out.println(h + "," + i + "," + j);
  }
} 

I'm failing to understand the o/p. Anyone help me please with the flow.


[HENRY: Added Code Tags. Formatted Code. And Disabled Smilies.]
[ December 20, 2006: Message edited by: Henry Wong ]

[marc weber]

Try adding some println statements to illustrate what's happening...

class A {
  public static void main(String args[]){
    int h = 0, i = 0, j = 0, k = 0;
    label1:
    for(;;) {
      h++;
      [B]System.out.println("h incremented to " + h);
      System.out.println(h + ", " + i + ", " + j + ", " + k);[/B]
      label2:
      do {
        i++;
        [B]System.out.println("i incremented to " + i);
        System.out.println(h + ", " + i + ", " + j + ", " + k);[/B]
        k = h + i + j;
        [B]System.out.println("k set to " + k);
        System.out.println(h + ", " + i + ", " + j + ", " + k);
        System.out.println("switching on " + k);[/B]
        switch(k) {
          default: break label1;
          case 1: break label1;
          case 2: break;
          case 3: break label2;
          case 4: continue label2;
          case 5: continue label1;
        }
      } while(++j < 5);
    }
    System.out.println(h + ", " + i + ", " + j + ", " + k);
  }
}

[ December 20, 2006: Message edited by: marc weber ]

[Aniket Patil]

All you need is some patience

     
hijkStatement Executed
0000
1000h++
1100i++
1102k=h+i+j
case 2: break
1112while(++j<5)
1212i++
1214k=h+i+j
case4: continue label2
1224while(++j<5)
1324i++
1326k=h+i+j
default: break label1
 

[ December 21, 2006: Message edited by: Aniket Patil ]