26 Questions
What type of value does a boolean expression evaluate to?
Boolean
Which operator is used to check if one value is less than another in a boolean expression?
>
What is the purpose of a branching program?
To make decisions based on conditions
In a boolean expression, what does the '==' operator check for?
Equality
What does the '<=' operator check for in a boolean expression?
Greater than or equal to
What is the purpose of the relational operator '!=' in a boolean expression?
Checks for not equal to
What is the purpose of a dry run in a branching program?
To analyze the program's behavior without executing it
Which type of statement in Java only has a true branch and no else part?
one-way selection statement
What is emphasized as the importance of clear nesting layout and indentation guidelines in Java?
Grading based on exam marks
What is the purpose of using curly brackets in Java if-else statements?
To group multiple statements into a single compound statement
What does the if statement in Java do if the boolean expression is true?
It is executed
What is the purpose of the PassFail1 program in the text?
To introduce a semantic error
What does the text provide examples of in Java, highlighting the need for layout style for clarity?
Compound statements
What is the purpose of nested selection statements in Java?
To have if statement branches as other if statements
What does the example exercise in the text require the program to do?
Input two values and print the larger one
What is the purpose of presenting an algorithm and Java code for grading based on exam marks in the text?
To emphasize clear nesting layout and indentation guidelines
What does the text emphasize about the order in which operations are evaluated in Java?
The operator precedence
Which logical operator is used to check if both the exam and coursework marks are at least 40?
&&
What is the result of the expression (a == 2 && b == 4 || a >= 1) when a = 1 and b = 4?
true
In Java, what is the purpose of using brackets in expressions?
To override normal precedence
What is the result of the expression (a == 2 && (b == 4 || a >= 1)) when a = 1 and b = 4?
true
What are the logical operators in Java that produce boolean results?
&&, ||, !
In the partial Java solution provided, what is the purpose of the 'final int PASS = 40;' line?
To define a constant pass mark
What is the result of the expression ( ((a >= 4) && (b < 3)) || (x == a) ) when a = 1, b = 4, and x = 1?
false
What is the purpose of using compound Boolean expressions in selection statements?
To provide complex conditions
What is the result of the expression ( a == 2 && b == 4 || a >= 1 ) when a = 2 and b = 4?
true
Study Notes
Java If-Else Selection Statements
- The text provides examples of Java if-else selection statements and their syntax.
- It explains the operator precedence in Java, including the order in which operations are evaluated.
- The text introduces a program, PassFail1, and identifies a semantic error in the code.
- It provides a solution to the semantic error by correcting the boolean expression.
- It presents an exercise to write a program that inputs two values from the user and prints out the larger of the two.
- The program uses the Java if-else selection statement to compare the input values.
- An example of a one-way selection statement is given, which only has a true branch and no else part.
- The semantics of the if statement are explained, emphasizing that the statement is executed if the boolean expression is true.
- Compound statements are discussed, highlighting the need for curly brackets if either branch of an if-else contains more than one statement.
- The text provides examples of compound statements and emphasizes the importance of layout style for clarity.
- It introduces nested selection statements, where the branches of an if statement can be other if statements.
- An algorithm and Java code for grading based on exam marks are presented, emphasizing the importance of clear nesting layout and indentation guidelines.
Test your understanding of Java if-else selection statements with this quiz. Explore the syntax, operator precedence, and error correction, and practice writing programs with one-way and nested selection statements. Sharpen your skills in using compound statements and creating clear layout styles for better code readability.
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