Java help
hoc34
week3_src.zipweek3_src/DoWhileLoopFactorial.java
week3_src/DoWhileLoopFactorial.java
package
edu
.
drexel
.
ct290
;
import
java
.
util
.
Scanner
;
public
class
DoWhileLoopFactorial
{
/**
* A factorial is calculated by multiplying a number by
* every integer less than itself except zero. For example the
* factorial of 4, written 4!, is 4*3*2*1 = 24.
*/
public
long
calculateFactorial
(
int
number
)
{
// declare and initialize a variable to hold the answer
long
factorial
=
number
;
// the do while loop will run the block of code between the braces
// as long as the condition in the while statement is true.
// The different between this and the while loop is that
// here, the code will always execute at least once.
do
{
// the print statement can help debug errors is in the code
System
.
out
.
println
(
"Fact: "
+
factorial
+
", number: "
+
number
);
// calculate the next factor
factorial
=
factorial
*
(
number
-
1
);
// decrement the number so that the next iteration of the loop
// will have the correct value to multiply
number
--
;
}
while
(
number
>
1
);
// return the answer to the caller.
return
factorial
;
}
public
static
void
main
(
String
[]
args
)
{
// Get the user input
Scanner
reader
=
new
Scanner
(
System
.
in
);
System
.
out
.
print
(
"What number do you want a factorial for: "
);
int
number
=
reader
.
nextInt
();
// Create a DoWhileLoopFactorial class
DoWhileLoopFactorial
loopFactorial
=
new
DoWhileLoopFactorial
();
// call calculateFactorial to compute the answer
long
factorial
=
loopFactorial
.
calculateFactorial
(
number
);
// Show the user the answer
System
.
out
.
println
(
"The answer is: "
+
factorial
);
}
}
__MACOSX/week3_src/._DoWhileLoopFactorial.java
week3_src/ForLoopFactorial.java
week3_src/ForLoopFactorial.java
package
edu
.
drexel
.
ct290
;
import
java
.
util
.
Scanner
;
public
class
ForLoopFactorial
{
/**
* A factorial is calculated by multiplying a number by
* every integer less than itself except zero. For example the
* factorial of 4, written 4!, is 4*3*2*1 = 24.
*/
public
long
calculateFactorial
(
int
number
)
{
// declare and initialize a variable to hold the answer
long
factorial
=
number
;
// The for loop has three parts:
// initialization: int i=number;
// condition: i>1;
// increment/decrement: i--;
// The variable in the initialization is called the control variable
// The initialization happens once when the loop starts.
// The loop will execute as long as the condition is true.
// The decrement will happen automatically after each iteration.
for
(
int
i
=
number
;
i
>
1
;
i
--
){
// the print statement can help debug errors is in the code
System
.
out
.
println
(
"Fact: "
+
factorial
+
", i: "
+
i
);
// calculate the next factor
factorial
=
factorial
*
(
i
-
1
);
}
// return the answer to the caller.
return
factorial
;
}
public
static
void
main
(
String
[]
args
)
{
// Get the user input
Scanner
reader
=
new
Scanner
(
System
.
in
);
System
.
out
.
print
(
"What number do you want a factorial for: "
);
int
number
=
reader
.
nextInt
();
// Create a WhileLoopFactorial class
ForLoopFactorial
loopFactorial
=
new
ForLoopFactorial
();
// call calculateFactorial to compute the answer
long
factorial
=
loopFactorial
.
calculateFactorial
(
number
);
// Show the user the answer
System
.
out
.
println
(
"The answer is: "
+
factorial
);
}
}
__MACOSX/week3_src/._ForLoopFactorial.java
week3_src/GradeBookEntry.java
week3_src/GradeBookEntry.java
package
edu
.
drexel
.
ct290
;
import
java
.
util
.
Scanner
;
import
edu
.
drexel
.
ct290
.
solution
.
GradeConverter
;
public
class
GradeBookEntry
{
private
Person
student
;
private
int
numericGrade
;
private
String
assessmentName
;
// The next six methods are just getters and setters
// for the member variables of this class.
public
Person
getStudent
()
{
return
student
;
}
public
void
setStudent
(
Person
student
)
{
this
.
student
=
student
;
}
public
int
getNumericGrade
()
{
return
numericGrade
;
}
public
void
setNumericGrade
(
int
numericGrade
)
{
this
.
numericGrade
=
numericGrade
;
}
public
String
getAssessmentName
()
{
return
assessmentName
;
}
public
void
setAssessmentName
(
String
assessmentName
)
{
this
.
assessmentName
=
assessmentName
;
}
public
void
printEntry
(){
System
.
out
.
println
(
student
.
toString
());
// instantiate a GradeConverter to get the letter grade.
GradeConverter
converter
=
new
GradeConverter
();
System
.
out
.
println
(
"Scored "
+
numericGrade
);
System
.
out
.
println
(
"Which is a: "
+
converter
.
convertGrade
(
numericGrade
));
System
.
out
.
println
(
"For assessment: "
+
assessmentName
);
}
public
static
void
main
(
String
[]
args
)
{
// instantiate the GradeBookEntry, just like we have
// done with the Scanner class.
GradeBookEntry
gradeBookEntry
=
new
GradeBookEntry
();
Scanner
reader
=
new
Scanner
(
System
.
in
);
// instantiate a new person object
Person
student
=
new
Person
();
student
.
getPersonData
();
gradeBookEntry
.
setStudent
(
student
);
System
.
out
.
print
(
"Enter this students numeric grade: "
);
int
grade
=
reader
.
nextInt
();
gradeBookEntry
.
setNumericGrade
(
grade
);
gradeBookEntry
.
setAssessmentName
(
"test1"
);
gradeBookEntry
.
printEntry
();
}
}
__MACOSX/week3_src/._GradeBookEntry.java
week3_src/GradeConverter.java
week3_src/GradeConverter.java
package
edu
.
drexel
.
ct290
;
public
class
GradeConverter
{
public
String
convertGrade
(
int
numberGrade
){
if
(
numberGrade
>
89
){
return
"A"
;
}
//else if...
else
{
}
// TODO: fill in the rest of this method.
// Use else if statements and else to finish
// the grade conversion.
}
/**
* This method gets input from the user
*
@return
a grade in number format from 0-100
*/
public
int
getNumberGrade
(){
int
userInput
=
0
;
// TODO complete this method
return
userInput
;
}
/**
*
@param
args
*/
public
static
void
main
(
String
[]
args
)
{
GradeConverter
converter
=
new
GradeConverter
();
int
input
=
converter
.
getNumberGrade
();
String
letterGrade
=
converter
.
convertGrade
(
input
);
System
.
out
.
println
(
"The letter grade for "
+
input
+
" is "
+
letterGrade
);
}
}
__MACOSX/week3_src/._GradeConverter.java
week3_src/GuessTheNumber.java
week3_src/GuessTheNumber.java
package
edu
.
drexel
.
ct290
;
import
java
.
util
.
Random
;
import
java
.
util
.
Scanner
;
public
class
GuessTheNumber
{
public
int
getRandomNumber
(
int
range
){
// Instantiate a random number generator
Random
rand
=
new
Random
();
//Generate a number in the given range
int
answer
=
rand
.
nextInt
(
range
)
+
1
;
return
answer
;
}
public
int
getUserGuess
(){
System
.
out
.
print
(
"Enter your guess: "
);
Scanner
reader
=
new
Scanner
(
System
.
in
);
return
reader
.
nextInt
();
}
public
boolean
compare
(
int
guess
,
int
answer
){
/* TODO: Check the answer. Return true if correct,
* otherwise return false and give an indication if
* the answer was too high or too low
*/
if
(
/* correct condition */
){
return
true
;
}
// TODO: fill in the code to tell if they are too high or too low
return
false
;
}
public
static
void
main
(
String
[]
args
)
{
System
.
out
.
println
(
"Lets play game. I'll pick a number 1-100 and you guess."
);
GuessTheNumber
guessNumber
=
new
GuessTheNumber
();
int
answer
=
guessNumber
.
getRandomNumber
(
100
);
int
guess
=
guessNumber
.
getUserGuess
();
// Write a loop that keeps asking the user to guess
// until they get it right.
System
.
out
.
println
(
"Congratulations! You got it: "
+
answer
);
}
}
__MACOSX/week3_src/._GuessTheNumber.java
week3_src/Instructions.docx
ASSIGNMENT: GUESSING GAME
· Using GuessTheNumber.java as a base, write a guessing game program.
· The computer should pick a number and the user will guess.
· The user should be able to guess until they win.
· The computer will tell the user if their guess is too high or too low.
· See Java HTP 6.9 to learn more about Java's Random class.
__MACOSX/week3_src/._Instructions.docx
week3_src/LogicalOperators.java
week3_src/LogicalOperators.java
package
edu
.
drexel
.
ct290
;
import
java
.
util
.
Scanner
;
public
class
LogicalOperators
{
private
final
int
MALE
=
1
;
public
boolean
getInput
(
String
question
){
Scanner
reader
=
new
Scanner
(
System
.
in
);
System
.
out
.
println
(
question
);
System
.
out
.
print
(
">"
);
// to enter a boolean you must type in true or false in the console
return
reader
.
nextBoolean
();
}
public
static
void
main
(
String
[]
args
)
{
LogicalOperators
logicalOps
=
new
LogicalOperators
();
boolean
condition1
;
boolean
condition2
;
System
.
out
.
println
();
condition1
=
logicalOps
.
getInput
(
"Is the first condition true or false?"
);
condition2
=
logicalOps
.
getInput
(
"Is the second condition true or false?"
);
// if condition1 is false, condition2 will not even be evaluated
if
(
condition1
&&
condition2
){
System
.
out
.
println
(
"Both conditions are true"
);
}
if
(
condition1
||
condition2
){
System
.
out
.
println
(
"At least one of your conditions are true"
);
}
if
(
!
condition1
){
System
.
out
.
println
(
"Condition1 is NOT true."
);
}
// This says: if condition 1 and 2 are NOT both true
if
(
!
(
condition1
&&
condition2
)
){
System
.
out
.
println
(
"At least one of your conditions are false"
);
}
// This is another way of expressing the same thing.
if
(
!
condition1
||
!
condition2
){
System
.
out
.
println
(
"At least one of your conditions are false"
);
}
}
}
__MACOSX/week3_src/._LogicalOperators.java
week3_src/LoopInput.java
week3_src/LoopInput.java
package
edu
.
drexel
.
ct290
;
import
java
.
util
.
Scanner
;
public
class
LoopInput
{
public
static
void
main
(
String
[]
args
)
{
Scanner
reader
=
new
Scanner
(
System
.
in
);
int
userInput
=
1
;
while
(
userInput
!=
0
)
{
System
.
out
.
println
(
"Enter two numbers for me to add:"
);
System
.
out
.
print
(
"First Number: "
);
int
a
=
reader
.
nextInt
();
System
.
out
.
print
(
"Second Number: "
);
int
b
=
reader
.
nextInt
();
int
answer
=
a
+
b
;
System
.
out
.
println
(
"The answer is: "
+
answer
);
System
.
out
.
println
(
"Press 1 to add more numbers, or 0 to exit:"
);
userInput
=
reader
.
nextInt
();
}
System
.
out
.
print
(
"Good bye!"
);
}
}
__MACOSX/week3_src/._LoopInput.java
week3_src/Person.java
week3_src/Person.java
package
edu
.
drexel
.
ct290
;
import
java
.
util
.
Scanner
;
public
class
Person
{
private
String
name
;
private
int
age
;
private
String
email
;
public
String
getName
()
{
return
name
;
}
public
void
setName
(
String
name
)
{
this
.
name
=
name
;
}
public
int
getAge
()
{
return
age
;
}
public
void
setAge
(
int
age
)
{
this
.
age
=
age
;
}
public
String
getEmail
()
{
return
email
;
}
public
void
setEmail
(
String
email
)
{
this
.
email
=
email
;
}
public
void
getPersonData
(){
Scanner
reader
=
new
Scanner
(
System
.
in
);
System
.
out
.
print
(
"Enter the person's name: "
);
name
=
reader
.
nextLine
();
System
.
out
.
print
(
"Enter the person's age: "
);
age
=
reader
.
nextInt
();
reader
.
nextLine
();
System
.
out
.
print
(
"Enter the person's email: "
);
email
=
reader
.
nextLine
();
}
public
String
toString
(){
return
"Name: "
+
name
+
"\nAge: "
+
age
+
"\nemail: "
+
email
;
}
}
__MACOSX/week3_src/._Person.java
week3_src/WhileLoopFactorial.java
week3_src/WhileLoopFactorial.java
package
edu
.
drexel
.
ct290
;
import
java
.
util
.
Scanner
;
public
class
WhileLoopFactorial
{
/**
* A factorial is calculated by multiplying a number by
* every integer less than itself except zero. For example the
* factorial of 4, written 4!, is 4*3*2*1 = 24.
*/
public
long
calculateFactorial
(
int
number
)
{
// declare and initialize a variable to hold the answer
long
factorial
=
number
;
// the while loop will run the block of code between the braces
// as long as the condition in parenthesis is true.
// If the condition is false right off the bat, then
// the loop code will never be executed at all.
while
(
number
>
1
){
// the print statement can help debug errors is in the code
System
.
out
.
println
(
"Fact: "
+
factorial
+
", number: "
+
number
);
// calculate the next factor
factorial
=
factorial
*
(
number
-
1
);
// decrement the number so that the next iteration of the loop
// will have the correct value to multiply
number
--
;
}
// return the answer to the caller.
return
factorial
;
}
public
static
void
main
(
String
[]
args
)
{
// Get the user input
Scanner
reader
=
new
Scanner
(
System
.
in
);
System
.
out
.
print
(
"What number do you want a factorial for: "
);
int
number
=
reader
.
nextInt
();
// Create a WhileLoopFactorial class
WhileLoopFactorial
loopFactorial
=
new
WhileLoopFactorial
();
// call calculateFactorial to compute the answer
long
factorial
=
loopFactorial
.
calculateFactorial
(
number
);
// Show the user the answer
System
.
out
.
println
(
"The answer is: "
+
factorial
);
}
}
