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Questions and Answers
What is the result of the condition (age > 40) && (term < 10) when age is 45 and term is 8?
What is the result of the condition (age > 40) && (term < 10) when age is 45 and term is 8?
- Undefined
- False
- True (correct)
- Zero
Which logical operation requires both expressions to be true for the entire condition to be true?
Which logical operation requires both expressions to be true for the entire condition to be true?
- XOR
- NOT
- OR
- AND (correct)
What is the effect of using the NOT operator on the expression age > 40 when age is 30?
What is the effect of using the NOT operator on the expression age > 40 when age is 30?
- The expression cannot be evaluated
- The expression remains unchanged
- The expression becomes false
- The expression becomes true (correct)
How does the precedence of relational operations compare to logical operations?
How does the precedence of relational operations compare to logical operations?
Evaluate the expression !(age > 40) given that age is 26. What is the result?
Evaluate the expression !(age > 40) given that age is 26. What is the result?
In the expression (6 * 3 == 36 / 2) || (13 < 3 * 3 + 4), what is the evaluation of the first condition?
In the expression (6 * 3 == 36 / 2) || (13 < 3 * 3 + 4), what is the evaluation of the first condition?
What happens if the expression (age > 40) || (term < 10) is evaluated when age is 50 and term is 12?
What happens if the expression (age > 40) || (term < 10) is evaluated when age is 50 and term is 12?
When using logical operators, what is the purpose of parentheses?
When using logical operators, what is the purpose of parentheses?
What is the primary purpose of relational operators in programming?
What is the primary purpose of relational operators in programming?
Which of the following expressions evaluates to 1 (true)?
Which of the following expressions evaluates to 1 (true)?
How do relational operators evaluate when they are adjacent with the same precedence?
How do relational operators evaluate when they are adjacent with the same precedence?
Which statement correctly describes a relational expression?
Which statement correctly describes a relational expression?
What is indicated by the expression 'D' = 'M'?
What is indicated by the expression 'D' = 'M'?
Which of the following is not a function of flow control in programming?
Which of the following is not a function of flow control in programming?
In terms of ASCII values, which statement is accurate?
In terms of ASCII values, which statement is accurate?
What does the flow of control allow a program to do?
What does the flow of control allow a program to do?
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Study Notes
Flow of Control
- Four flow control structures:
- Sequential
- Selection
- Repetition
- Invocation
- Selection is used to choose which statements to execute based on a condition
Relational Operators
- Used for comparisons
- Have binary meaning (require 2 operands)
- Left to right associativity
- Examples: > (greater than), < (less than), == (equal to), != (not equal to)
Relational Expressions
- Known as conditions
- Evaluate to 1 (true) or 0 (false)
- Example: 3<4 evaluates to 1, 2.0>3.3 evaluates to 0
Logical Operations
- Used to create complex conditions
- AND (&&), OR (||), NOT (!)
AND Operator
- True only if both expressions are true
- Example: (age > 40) && (term < 10) is true only if both age is > 40 and term < 10
OR Operator
- True if either or both expressions are true
- Example: (age > 40) || (term < 10) is true if either age > 40 or term < 10
NOT Operator
- Used to reverse the state of an expression
- Example: If age > 40 is false, !(age > 40) is true
Operator Precedence and Associativity
- Parenthesis are used to alter operator priority and improve readability
- Relational and logical expressions have a hierarchy of execution
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