# Logical Operators.

Logical Operators.

 The logical operators for AND (&&) and OR ( ) are used to combine simple relational statements into more complex expressions. The NOT (!) operator is used to negate a boolean statement.
```
size(640, 360);
background(126);

boolean test = false;

for (int i = 5; i <= height; i += 5) {
// Logical AND
stroke(0);
if((i > 35) && (i < 100)) {
line(width/4, i, width/2, i);
test = false;
}

// Logical OR
stroke(76);
if ((i <= 35) || (i >= 100)) {
line(width/2, i, width, i);
test = true;
}

// Testing if a boolean value is "true"
// The expression "if(test)" is equivalent to "if(test == true)"
if (test) {
stroke(0);
point(width/3, i);
}

// Testing if a boolean value is "false"
// The expression "if(!test)" is equivalent to "if(test == false)"
if (!test) {
stroke(255);
point(width/4, i);
}
}

```

## Functions Used

stroke()

Sets the color used to draw lines and borders around shapes

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size()

Defines the dimension of the display window width and height in units of pixels

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if

Allows the program to make a decision about which code to execute

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point()

Draws a point, a coordinate in space at the dimension of one pixel

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line()

Draws a line (a direct path between two points) to the screen

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background()

The background() function sets the color used for the background of the Processing window

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