Quiz on the Single-branch if

Classic programmed-learning exercises, refreshed for modern Java and presented in the current MrStyner.com portfolio style.

Modern Java noteThis archive has been refreshed for Java 25 LTS. Core language concepts remain useful, while outdated setup instructions and browser-era Java are labeled or replaced. Java 26 is the current feature release; Java 25 is used here as the stable teaching baseline.

created: 05/17/1998; revised: 10/04/03, 03/01/06

on the Single-branch if

This is a practice quiz. The results are not recorded anywhere and do not affect your grade. The questions on this quiz might not appear in any quiz or test that does count toward your grade.

Instructions: For each question, choose the single best answer. Make your choice by clicking on its button. You can change your answers at any time. When the quiz is graded, the correct answers will appear in the box after each question.


1. Evaluate the following expression: 

 
1 + 2 == 3
A.    true
B.    false
C.    unpredictable

2. Evaluate the following expression: 

 
25 < 5 * 5
A.    true
B.    false
C.    unpredictable

3. Evaluate the following expression: 

 
8 + 1 >= 3 * 3
A.    true
B.    false
C.    unpredictable

4. What does the following code fragment write to the monitor? 

int height = 10;
if ( height <= 12 )
  System.out.print("Low bridge: ");
System.out.println("proceed with caution.");
A.    Nothing is written.
B.    Low bridge:
C.    proceed with caution.
D.    Low bridge: proceed with caution.

5. What does the following code fragment write to the monitor? 

int height = 13;
if ( height <= 12 )
  System.out.print("Low bridge: ");
System.out.println("proceed with caution.");
A.    Nothing is written.
B.    Low bridge:
C.    proceed with caution.
D.    Low bridge: proceed with caution.

6. What does the following code fragment write to the monitor? 

int depth =  8 ;
if ( depth >= 8 )
{
  System.out.print("Danger: ");
  System.out.print("deep water. ");
}
System.out.println("No swimming allowed.");
A.    Danger:
B.    Danger: deep water.
C.    Danger: deep water. No swimming allowed.
D.    deep water. No swimming allowed.

7. Evaluate the following expression: 

10.0 + 0.10 < 11.0
A.    true
B.    false
C.    unknown

8. Evaluate the following expression: 

10.0 + 0.10 > 10.0
A.    true
B.    false
C.    unknown

9. Evaluate the following expression: 

10.0 + 1.0/10.0 < 1.10
A.    true
B.    false
C.    unknown

10. Fill in the blank so people under 21 years are offered Grape Soda. 

if ( age  _________ 21 )
  System.out.println("How about a Brew?");
else
  System.out.println("Care for some Grape Soda?");
A.    <
B.    ==
C.    !=
D.    >=

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