Difference between revisions of "statement"
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| − | + | Statements are parts of a [[Executable program|program]] that alter its state, e. g. by changing a [[Variable|variable’s]] value. | |
| − | [[ | + | |
| − | [[ | + | == classification == |
| − | [[ | + | One may distinguish between simple and structured statements. |
| − | + | ||
| + | Elementary statements are those, which can not be broken down into smaller pieces – “sub-statements”. | ||
| + | These are | ||
| + | * [[Becomes|assignments]], | ||
| + | * [[Routine#invoking routines|procedure calls]], | ||
| + | * [[Raise|<syntaxhighlight lang="pascal" enclose="none">raise</syntaxhighlight>]] control transfer, and | ||
| + | * [[Goto|<syntaxhighlight lang="pascal" enclose="none">goto</syntaxhighlight> jumps]]. | ||
| + | Complex statements are | ||
| + | * compound statements (also called ''sequence'') delimited by [[Begin|<syntaxhighlight lang="pascal" enclose="none">begin</syntaxhighlight>]] and [[End|<syntaxhighlight lang="pascal" enclose="none">end</syntaxhighlight>]], | ||
| + | * inline assembler blocks delimited by [[Asm|<syntaxhighlight lang="pascal" enclose="none">asm</syntaxhighlight>]] and <syntaxhighlight lang="pascal" enclose="none">end</syntaxhighlight>, | ||
| + | * [[Branches|branches]], and | ||
| + | * [[Loops|loops]]. | ||
| + | |||
| + | == remarks == | ||
| + | In contrast to statements, instructions are the building blocks in low-level [[Assembly language|assembly language]]. | ||
| + | |||
| + | [[;|Empty statements]] are not statements in a formal sense, since they merely exist to satisfy syntax requirements in a non-superfluous manner. | ||
| + | |||
| + | == see also == | ||
| + | * [[Block|block]] | ||
| + | * [[expression]] | ||
| + | * [https://www.freepascal.org/docs-html/ref/refch13.html Chapter “Statements” in the ''Free Pascal reference guide''] | ||
Revision as of 18:45, 23 August 2019
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Statements are parts of a program that alter its state, e. g. by changing a variable’s value.
classification
One may distinguish between simple and structured statements.
Elementary statements are those, which can not be broken down into smaller pieces – “sub-statements”. These are
- assignments,
- procedure calls,
raisecontrol transfer, andgotojumps.
Complex statements are
- compound statements (also called sequence) delimited by
beginandend, - inline assembler blocks delimited by
asmandend, - branches, and
- loops.
remarks
In contrast to statements, instructions are the building blocks in low-level assembly language.
Empty statements are not statements in a formal sense, since they merely exist to satisfy syntax requirements in a non-superfluous manner.
