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C# Basics: Expressions, Conditionals, and Looping Constructs Overview

This overview covers essential C# concepts including statements, expressions, operators, conditionals (if, switch), and looping structures (while, for, foreach). It delves into statement types, declaration, variable usage, and execution flow control such as jump statements (break, continue, return). With a focus on exception handling using try-catch-finally blocks and resource management through the using statement, this guide provides a comprehensive foundation for developing robust C# applications. Ideal for beginners and intermediate programmers looking to solidify their understanding of C# programming fundamentals.

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C# Basics: Expressions, Conditionals, and Looping Constructs Overview

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  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;

  13. Expressions • Primary • void • Arithmetic • Assignment

  14. Operators • Operators • Precedence • Associativy

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

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

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

  18. 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>;

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

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

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

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

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

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

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