Ch4_Selection Structures

Ch4_Selection Structures - 1 The Boolean Data Type • This...

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Unformatted text preview: 1 The Boolean Data Type • This data type allows us to represent something as either True or False. • Syntax: Const flag = True; Var Variable_Name : Boolean • Example: Var Flag: Boolean Flag := True Writeln(Flag) (* will give as output True *) 2 Relational Operators Simple Boolean Expressions • Operators used for comparison are called “Relational Operators”, Examples: =, >, <, <=, >=, <> • A Boolean expression is an expression that takes a Boolean value (True / False) • Example – comparing two numbers or variables if they are equal • Note: Only data of the same type can be compared. 3 Relational Operators-Boolean Expressions (Priorities) • Note: operand1<>operand2 allows you to test if operand1 is different from operand2. 4 =, >, <, <=, >=, <> 3 +, - 2 / , *, Div, Mod 1 ( ) Priority Operator 4 Relational Operators-Boolean Expressions • A Boolean Expression can be assigned to a Boolean Variable. • Example: Var falg: Boolean; anInt: Integer; anInt := 10; Falg := (anInt>5);(*Flag has a boolean value True because anInt 10 is greater than 5*) 5 Logical Operator AND-OR Compound Expressions • Used to connect two Boolean expressions, thus composing one single expression. • Example: ( 3 > 2) And ( 5 > 4) (* True And True gives True *) ( 3 >2) Or (3 <2) (* True Or False gives True *) • When AND is used to join two expressions, the resulting compound expression is True only if both expressions are True. 6 Logical Operators AND-OR The NOT operator • When an Or operator is used to join two expressions, the resulting compound expression is FALSE only if both expressions are FALSE. expressions are FALSE....
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This note was uploaded on 11/04/2009 for the course SSE CSC 1400 taught by Professor Mhamdi during the Spring '09 term at Al Akhawayn University.

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Ch4_Selection Structures - 1 The Boolean Data Type • This...

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