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Structure Statements
^^^^^^^^^^^^^^^^^^^^
.. crowbar:element:: StructureStatement <- IfStatement / SwitchStatement / WhileStatement / DoWhileStatement / ForStatement
A structure statement creates some nonlinear control structure.
There are several types of these structures.
.. crowbar:element:: IfStatement <- 'if' '(' Expression ')' Block ('else' Block)?
An if statement allows some action to be performed only sometimes, based on the value of the expression.
Compile-time Behavior:
If the expression does not have type bool, the compiler must emit an error.
Runtime Behavior:
First, the expression is evaluated.
If the expression evaluates to a ``bool`` value of ``true``, then the first block will be executed.
If the expression evaluates to a ``bool`` value of ``false``, either the second block is executed or nothing is executed.
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