# 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

size()

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

if

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

point()

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