Do while

Any of the statements can be null statements. A do...while loop is slightly faster than a while or for loop, and requires fewer bytes of memory than a while or for loop. (However, the speed increase and byte difference does not apply to scripts compiled in Mono)

//Counts from 1 to 5
default
{
    state_entry()
    {
        integer olf;   // Without applied value an integer will be defaulted to zero.
        do
            llSay(0, (string) ++olf);       // Increment before the while condition 
        while (olf < 5);                    // On the first pass/loop olf = 1
    }
}

//Counts from 0 to 4
default
{

   state_entry()
   {
       integer olf;
       do
           llSay(0, (string)olf);    // olf is still equal to zero at first iteration
       while (++olf < 5);            // Increments then does the while-test
   }

}

//Counts from 0 to 4 and comments as it loops (block statement demo)
default
{

   state_entry()
   {
       integer olf;
       do
       {   // Curly brackets are required since there is more than one statement within the do-loop
           llSay(0, (string)olf);    
           llSay(0, "looping");
       }
       while (++olf < 5);
   }

}

//Practical example of where a do/while loop is more immediately useful than a while loop:
//Note that a sensor event always contains input data, so the 'do' always has something to process

   sensor(integer num)
   {   
       if (num > 12)
           num = 12;
       do
       {   
           // --num decrements num before using it to pick up a detected avatar's name. Thus we retrieve #11 through #0
           gNameList += [llGetSubString(llDetectedName(--num), 0, 23)];    //sometimes avatar names are too long for dialog display
           gKeyList  += [llDetectedKey(num)];    //we will dialog select avatar by name, but still need their key
                                                 //even if their name has not been truncated above
       }  while (num > 0);
       llDialog(llGetOwner(), "Choose an avatar.", gNameList, gDlgChan);  //channel is pre-defined when llSensor is triggered

    }