Java file boolean w6 | Computer Science homework help








Java File

Boolean W6









Using Relational and Logical Operators to Evaluate Logical (Boolean) Expression

Evaluate the logical (Boolean) expressions in the following exercises and circle the correct answer after you evaluation. For char and String types, use the Unicode collating sequence.


Result (Circle correct answer)

1.      int num1 = 3,  num2 = 2;

(num1  >  num2)

T          F                                                                        

2.     double hours = 12.8;

(hours  >  40.2)

T          F

3.     int  funny  =  7;

(funny  !  =  1)

T          F

4.     char  letter  =  ‘ A ‘;

(‘a’ < letter )

T          F

5.     int  count  =  1;

count  < = 4;

T          F

6.     double  y  =  -2 . 3;

y  > =  0.0;

T          F


Expressions Use the following values:

X = false,  y = false,  z = true


(Circle all possible answers)

1.     !  (  x | | y)  | |  z

T     F     short – circuit

2.     x  &&  z  &&  y

T     F     short – circuit

3.     !  x   |  |  (y   |  |  !  z)  

T     F     short – circuit

4.     x   | |   (z   &&  (y   | |   x)  )

T     F     short – circuit

5.     true  | |  !  z  &&  y

T     F     short – circuit

6.     !  (x  | |  y)  | |  x

T     F     short – circuit

7.     z   &&   x   &&   y

T     F     short – circuit

8.     !   x   | |   (y   | |   !   z)

T     F     short – circuit

9.     x   | |   (y   &&   (x   | |   z)  )

T     F     short circuit

10.   false   | |   !   x   &&   y

T     F     short – circuit



Expression Use the  following values:

X = false,  y = false,  z = true

T     F    

(Circle all possible answers)



(Circle all possible answers)

1.     String  name1 = “Aaron” ;

String  name2 = “aaron” ;

name1. compareTo(name2)= = 0

T     F 

2.     String name1 = “Aaron” ;

String name2 = “Aardvark” ;

namel. compareTo(name2) > 0

T          F

3.     Boolean flag = true;

int a = 2,  b = 5,  c = 10;

(a  *  b  <  =  c  &&  !  flag)

T          F

4.     String  name1  =  “Aaron” ;

String  word  =  “A” ;

name1 .compareTo(word)  <  0

T          F

5.     int  x = 2;

double   y   =   1 . 1;

(x    y)  = =  0 . 9


T          F























Consider the following relational database that Best Airlines uses to keep track of its mechanics, their skills, and their airport locations.  Mechanic number (MECHNUM), airport name (AIRNAME), and skill number are all unique fields. SIZE is an airport’s size in acres.  SKILLCAT is a skill category, such as an engine skill, wing skill, tire skill, etc.  YEARQUAL is the year that a mechanic first qualified in a particular skill: PROFRATE is the mechanic’s proficiency rating in a particular skill.








SKILLNUM                    SKILLNAME                     SKILLCAT








Write SQL SELECT commands to answer the following queries.

a.     List the names and ages of all the mechanics.

b.     List the airports in California that are at least 20 acres in size and have been open since 1935. Order the results from smallest to largest airport.

c.      List the airports in California that are at least 20 acres in size or have been open since 1935.

d.     Find the average size of the airports in California that have opened since 1935.

e.      How many airports have been open in California since 1935?

f.       How many airports have been open in each state since 1935?

g.     How many airports have been open in each state since 1935?  Include in your answer only states that have at least five such airports.

h.     List the names of the mechanics who in California.

i.       Fan blade replacement is the name of a skill.  List the names of the mechanics that have a proficiency rating of 4 in fan blade replacement.

j.       Fan blade replacement is the name of a skill.  List the mechanics who work in California who have a proficiency rating of 4 in fan blade replacement.

k.     List the total combined salaries of all the mechanics who work in each city in California.

l.       Find the largest of all of the airports.

m.  Find the largest airport in California.

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