Solution to Question 4-1
Code that performs a task.
Solution to Question 4-2
An operator.
Solution to Question 4-3
An operator combines simple expressions into more complex expressions. It does so by creating relationships between the simple expressions that can then be evaluated.
Solution to Question 4-4
An operator.
Solution to Question 4-5
An operator that combines two expressions into a more complex single expression.
Solution to Question 4-6
An operator that takes three operands.
Solution to Question 4-7
Nothey take only numbers.
Solution to Question 4-8
It's an array, integer, or string.
Solution to Question 4-9
Yesyou'll end up with the wrong operator.
Solution to Question 4-10
It checks whether or not a variable is set.
Solution to Question 4-11
The switch statement is written as follows:
switch ($action) { case "add": $x = $x+y; break; case "subtract": $x = $x-y; break; case "multiply": $x = $x*$y; break; case "divide": $x = $x/$y; break; }
Solution to Question 4-12
It tells PHP not to execute cases other than the matching case.
Solution to Question 4-13
The loop is written as follows:
<?php for ($num = 10; $num >= 1; $num--) { print "$num<br>"; } ?>