Expressions, Conditionals and Looping

1. Expressions, Conditionals and Looping CS 3260 Version 1.0

2. Overview • Statements • Expressions • Operators • Selection (Conditionals) • Iteration (Loop)

3. C# Statement Types

4. Statements • Declaration • Variable • Method • Blocks { … } • Expression • Selection (Conditional) • if/if-else/switch/?: • Iteration (Loop) • while/do-while/for/foreach

5. Statements • Statement Lists { … } • ; - Empty • <label>: <statement>; • Declaration - <type> <ident> = <init>; • Expression • Selection (Conditional) • Iteration (Loop)

6. Jump Statements • goto <label> - jump to label • break – switch/loops • continue - loops • return – no-value/value • throw – Exception object • yield – continue/break

7. Exception Handling Statementschecked/unchecked Block • try-catch-finally • checked/unchecked

8. try-catch-finally • try: try-blockcatch(...) { //catch-block-1 }...catch(...) { //catch-block-n } • try: try-block finally: finally-block

9. using Statements • using <namespace> • using ( resource-acquisition ) embedded-statement

10. Other Statements • lock • yield • fixed

11. lock Statement • lock ( expr ) embedded-statement

12. yield Statement • yield return expr ; • yield break;

20. Expressions • Primary • void • Arithmetic • Assignment

21. Operators • Operators • Precedence • Associativy

25. Suffixes real-type-suffix: one ofF f D d M m

26. Selection - Conditional • if (<boolean expression>) <statement>; • if(<boolean expression>) <statement> else <statement>; • switch(<integer expression) { <statements> } • <datatype> <ident> = (<expression)?<true_value>:<false_value>

27. if - Selection • if ( expr ) then-stmt else else-stmt

28. Iteration - Loop • while(<bool expression>) <statement>; • do <statement> while(<bool expression); • for(<init statement>; <boolexpr>; <change statement>;) <statement>; • foreach(<type> <ident> <type> in <ident>) <statement>;

29. while - Loop • while-statement:while(boolean-expression ) embedded-statement

30. do loop • do-body while ( expr ) ;

31. for - Loop • for ( for-initializer ; for-condition ; for-iterator ) embedded-statement

32. foreach Loop • foreach(<datatype> <ident> in <enumerable_collection>) • <statement(s)>

33. throw - return • throw expr ; • return expr ; or return ;

34. Executable Statements • Methods • Properties • Events • Indexers • User-defined operators • Instance constructors • Static constructors • Destructors