Respond to the coin toss in surfer-speak in Java

Creator PDF-417 2d barcode in Java Respond to the coin toss in surfer-speak

The outer if structure determines which character is speaking The else clause of this case will happen if character is not 1, so all the LEET stuff goes in the else clause

Now that you know you re speaking in gamer code, determine what to say by consulting the coin in another if statement

Nested if structures aren t all that difficult, but they can be messy, especially as you get several layers deep (as you will, eventually) The following tips help make sure that everything makes sense: Watch your indentation Be vigilant on your indentation scheme An editor like Aptana, which automatically indents your code, is a big plus Indentation is a great way to tell what level of code you re on Use comments You can easily get lost in the logic of a nested condition Add comments liberally so that you can remind yourself where you are in the logic Note that I specify which if statement is ending Test your code Just because you think it works doesn t mean it will Surprises will happen Test thoroughly to make sure that the code does what you think it should do

Working with for loops Building while loops Recognizing troublesome loops Catching crashes and logic errors Using the Aptana line-by-line debugger

omputers programs can do repetitive tasks easily, thanks to a series of constructs called loops In this chapter, you discover the two major techniques for managing loops Loops are powerful, but they can be dangerous It s possible to create loops that act improperly, and these problems are difficult to diagnose I demonstrate several powerful techniques for identifying issues in your code

A loop is a structure that allows you to repeat a chunk of code One standard type of loop the for loop repeats a chunk of code a certain number of times Figure 3-1 Shows a for loop in action Although it looks like ten different alert statements appear, only one exists; it s just repeated ten times

I showed the first few dialogs and the last You should be able to get the idea Be sure to look at the actual program on the CD-ROM to see how it really works

You can see the structure of the for loop in the following code:

<script type = text/javascript > //<![CDATA[ //from BasicForhtml for (lap = 1; lap <= 10; lap++){ alert( now on lap: + lap + ); } // end for //]]> </script>

for loops are based on an integer, which is sometimes called a sentry variable In this example, lap serves as the sentry variable You typically use the sentry variable to count the number of repetitions through a loop The for statement has three distinct parts: Initialization: This segment (lap = 1) sets up the initial value of the sentry Condition: The condition (lap <= 10) is an ordinary condition (although it doesn t require parentheses in this context) As long as the condition is evaluated as true, the loop will repeat Modification: The last part of the for structure (lap++) indicates how the sentry will be modified throughout the loop In this case, I add 1 to the lap variable each time through the loop The for structure has a pair of braces containing the code that will be repeated As usual, all code inside this structure is indented You can have as much code inside a loop as you want The lap++ operator is a special shortcut Adding 1 to a variable is common, so the lap++ operation means add 1 to lap You can also write lap = lap + 1, but lap++ sounds so much cooler When programmers decided to improve on the C language, they called the new language C++ Get it It s one better than C! Those computer scientists are such a wacky bunch! When you know how many times something should happen, for loops are pretty useful