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diff --git a/language/statements/structure.rst b/language/statements/structure.rst new file mode 100644 index 0000000..9330bf6 --- /dev/null +++ b/language/statements/structure.rst @@ -0,0 +1,21 @@ +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. |