Java Selection Structures Quiz

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Questions and Answers

What is the purpose of the if-else statement in Sample Program 1?

  • To check if the number entered is a positive value
  • To check if the number entered is zero (correct)
  • To print an error message if the number entered is invalid
  • To check if the number entered is a negative value

What will be the output of Sample Program 1 if the user enters 5?

  • Number entered is zero
  • 5 is a positive value (correct)
  • An error message is printed
  • 5 is a negative value

What is the purpose of the else-if statement in Alternative Program 2?

  • To print an error message if the number entered is invalid
  • To check if the number entered is a positive value
  • To check if the number entered is zero (correct)
  • To check if the number entered is a negative value

If the user inputs -8 in Sample Program 2, what will be the output?

<p>-8 is a negative value (B)</p> Signup and view all the answers

What will Sample Program 2 display as output if the user enters 0?

<p>Number entered is zero (C)</p> Signup and view all the answers

What would happen if 'number' is not declared or initialized before using it in Sample Program 2?

<p>It will print an error message (C)</p> Signup and view all the answers

What is the purpose of the 'else-if' statement in Java?

<p>To execute a statement if none of the previous 'if' or 'else-if' conditions are true (D)</p> Signup and view all the answers

What does the final 'else' statement act as in a sequence of conditional tests?

<p>Default condition when all other conditional tests fail (D)</p> Signup and view all the answers

What is the purpose of using logical operators in conditional statements in Java?

<p>To allow more than one criteria in a conditional statement (D)</p> Signup and view all the answers

In a Java 'if' statement, what is the role of the logical operator '&&'?

<p>Returns true if both Condition A and B are true (B)</p> Signup and view all the answers

What is the significance of the order of evaluation in logical operators in Java?

<p>It determines which expression is evaluated first (D)</p> Signup and view all the answers

What does the '||' logical operator return in a Java 'if' statement?

<p>True if either Condition A or B is true, or both are true (A)</p> Signup and view all the answers

In Java, when using the logical operator '!', what is the result if Condition A is true?

<p>False (B)</p> Signup and view all the answers

What does the logical expression 'num1 > 16 && num1 < 20 || num2 == 20 && (num2 > 10 || num2 < 5)' return?

<p>True if either set of conditions (separated by &amp;&amp;) are true (B)</p> Signup and view all the answers

What is the purpose of using multiple comparisons with 'else-if' structure in Java?

<p>To allow ordering of execution based on multiple criteria (D)</p> Signup and view all the answers

What happens when a sequence of 'else-if' statements are evaluated and a true condition is found?

<p>The statement associated with the true condition is executed and the rest of the chain is bypassed. (D)</p> Signup and view all the answers

What is considered to be the default condition when all other conditional tests fail in Java?

<p>The final 'else' statement (B)</p> Signup and view all the answers

In a truth table for logical operators, what does p && q return when p = F and q = F?

<p>F (False) (D)</p> Signup and view all the answers

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Related Documents

Week 3 If Else If Else.pdf

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