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---
layout: default
---
<h3>TrueFalse</h3>
<p>Boolean data is one bit of information. True or false.
It is common to use Booleans with control statements to
determine the flow of a program. In this example, when the
boolean value "x" is true, vertical black lines are drawn and when
the boolean value "x" is false, horizontal gray lines are drawn.</p>
<p><a href="http://processing.org/learning/basics/truefalse.html">Original Processing.org Example: TrueFalse</a><br>
<div class="learning-demo"><script type="application/processing">
boolean x = false;
size(200, 200);
background(0);
stroke(0);
for (int i = 1; i < width; i += 2)
{
if (i < width/2) {
x = true;
} else {
x = false;
}
if (x) {
stroke(255);
line(i, 1, i, height-1);
}
if (!x) {
stroke(126);
line(width/2 , i, width-2, i);
}
}
</script><canvas width="200" height="200"></canvas></div></p>
<div style="height:0px;width:0px;overflow:hidden;"></div>
<div class="code"><pre name="code" class="processing">// All Examples Written by Casey Reas</a> and Ben Fry</a>
// unless otherwise stated.
boolean x = false;
size(200, 200);
background(0);
stroke(0);
for (int i = 1; i < width; i += 2)
{
if (i < width/2) {
x = true;
} else {
x = false;
}
if (x) {
stroke(255);
line(i, 1, i, height-1);
}
if (!x) {
stroke(126);
line(width/2 , i, width-2, i);
}
}</pre></div>