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Understanding Decision-Making Statements in Pascal Programming

Learn about the IF-THEN-ELSE and CASE decision-making statements in Pascal programming. Understand how the compiler evaluates Boolean expressions, executes statements based on conditions, and compares expressions for logical operations.

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Understanding Decision-Making Statements in Pascal Programming

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  1. More examples of programs with procedures

  2. Making decisions • In Pascal there are two types of statements that enable the computer to make decisions. • IF-THEN-ELSE • CASE

  3. IF-THEN (ELSE to be discussed later) IF (Boolean expression) THENSTATEMENT; • The compiler will evaluate the Boolean expression. If it is TRUE then the STATEMENT is executed. If it is FALSE then the STATEMENT is skipped.

  4. Comparison expressions • = Equal to • <> Not equal to • < Less than • > Greater than • >= Greater than or equal • <= Less than or equal

  5. IF-THEN-ELSE IF (Boolean expression) THENSTATEMENT1 ELSE STATEMENT2; • The compiler will evaluate the Boolean expression. If it is TRUE then STATEMENT1 is executed. If it is FALSE then STATEMENT2 is executed. • Note: no semicolon after STATEMENT1.

  6. For Tuesday • Reminder: HW #5 is due • IT is on the web - Marateck’s HW #4 • Read sections 7.1-7.6 and 7.7-7.12

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