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Understanding Boolean Expressions and Operators in C++ Programming

This course segment introduces Boolean expressions, which evaluate to true or false in C++ programming. It covers the use of comparison operators like greater than (>) and demonstrates examples to illustrate how these expressions work in determining truth values. Furthermore, it delves into relational and equality operators, including AND (&&), OR (||), and NOT (!), explaining how to form complex logical statements. Lastly, it discusses the precedence of operators and DeMorgan’s theorem, essential for effective programming logic and condition evaluations.

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Understanding Boolean Expressions and Operators in C++ Programming

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  1. ECE 1305Introduction to Engineering and Computer Programming Section 10Boolean Expressions

  2. Boolean Expressions • Boolean expressions are expressions that are either true or false. • Comparison Operators such as > (greater than) are used to compare variables and/or numbers. • Example: (hours > 40) • The parentheses act as a function that returns a logical true or false.

  3. Relational and Equality Operators

  4. C++ Relational and Equality Operators int kIce = 273; int kTemp = 250; char init = ’J’; double pressure = 37.2; double MAX_PRESSURE = 38.5; (pressure < MAX_PRESSURE) true (kTemp <= kIce) true (init > ’K’) false (250 >= kTemp) true

  5. C++ Relational and Equality Operators int kIce = 273; int kTemp = 250; char init = ’J’; double pressure = 37.2; double MAX_PRESSURE = 38.5; (init == ’Q’) false (kIce != kTemp) true (kTemp + 30 > kIce) true (kTemp % 2 == 1) false

  6. Logical Operators • More complicated logical statements may be formed using the AND operator (&&) or the OR operator (||) or the NOT operator ( ! ).

  7. Logical Operators • AND Operator (&&)

  8. Logical Operators • OR Operator (||)

  9. Logical Operators • NOT Operator (!)

  10. C++ Relational and Equality Operators int kIce = 273; int kTemp = 250; char init = ’J’; double pressure = 37.2; double MAX_PRESSURE = 38.5; (kIce > 250 && kIce < 280) true (pressure > 40 || init == ’J’) true !(init > ’K’) true (250 >= kTemp && kIce != 273) false (kIce != 273 && 250 >= kTemp) false (short-circuit evaluation)

  11. Precedence of Operators

  12. Boolean Data Type int age = 50; int yearsService = 30; bool eleigible; eligible = (age + yearsService) > 85; assigns the variable eligible the value false

  13. DeMorgan’s Theorem • bool A; • bool B; • !(A && B) = !A || !B • !(A || B) = !A && !B

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