KonsolScript:Tutorials:Looping

From GPWiki

Looping

Often times, there's a need to repeat a series of commands. This can be done with looping.

KonsolScript, supports two types of looping.

While statement

The while statement executes a series of commands written inside its scope.

//syntax of while
  while(/* conditional*/) {
    //scope...
  }

The syntax is as simple as what's shown above. All you have to do is fill-up the blanks. :D

Let's say we want to repeatedly output "Hello!", we write Konsol:Log inside scope of while.

//demonstrating while statement
  while(/* conditional*/) {
    //scope...
    Konsol:Log("Hello!")
  }

But the scope will only be executed when the conditional question answers yes. So, we need a conditional that leads to answer yes -- let's add 1 EQ 1.

//demonstrating while statement (part 2)
  while(1 EQ 1) {
    //scope...
    Konsol:Log("Hello!")
  }

There you go. A while statement.

For statement

A for statement works just like while does. But for statement differ in syntax since a for loop counts how many times it has loop.

//syntax of for statement
  for(init;/*conditional*/;next) {
    //scope...
  }

Looks more complicated, huh? Here's a simple demo.

//demonstrating for statement
function main() {
  Var:Number x;
  for(x=1; x LE 10; x++) {
    //scope...
    Konsol:Log("Hello!")
  }
}

The sample above prints out "Hello!", 10 times.

Var:Number x;

First, we need to declare a variable to be used for counting.

x=1;

Then we have the init (from the word initialize). Here, we begin our counting.

x LE 10;

Then we need to provide the maximum number to count. We typed-in LE 10 since we only wanted to count from 1 to 10.

x++

Then we have our counting method. x++ means we add 1 to x every loop.

for(x=1; x LE 10; x++) {
    //scope...
  }

As a single-line command, what our code meant is to execute the commands in its scope while counting from 1 to 10. Once 10 is reached, execute for the last time the command/s in scope of for statement.

Konsol:Log("Hello!")

It so happen we only wanted to print "Hello!".

So there you have a for statement.

Last Words

We can actually count from 10 to 1. We just have to change the logic of the program.

//demonstrating for statement counting downward
function main() {
  Var:Number x;
  for(x=10; x GE 1; x--) {
    //scope...
    Konsol:Log("Hello!")
  }
}

We can also do counting on while statement.

//demonstrates counting with while statement
function main() {
  Var:Number x;
  x=1;
  while(x LE 10) {
    //scope...
    Konsol:Log("Hello!")
    x++;
  }
}

And of course, it could do some countdown too. Choose whatever looks more elegant to you.

~creek23~