Java | JSP | JSF Answers

Square at Alternate Indices

Given an array

myArray of numbers, write a function to square the alternate numbers of the myArray, starting from index 0 using the array method map.Input

• The input will be a single line containing an array myArray

Output

• The output should be a single line containing an array with alternate numbers squared

Constraints

• Each value in the array must be a number

Sample Input 1

[ 1, 2, 3, 4, 5 ]

Sample Output 1

[ 1, 2, 9, 4, 25 ]

Sample Input 2

[ 2, 4 ]

Sample Output 2

[ 4, 4 ]

Filter Unique Characters

Given a string

myString as an input, write a JS program to find the unique characters from the myString.

Quick Tip

You can use the array method indexOf().

Input

• The input will be a single line containing a string myString

Output

• The output should be a single line containing an array of unique characters

Sample Input 1

Was it a cat I saw?

Sample Output 1

[

'W', 'a', 's', ' ',

'i', 't', 'c', 'I',

'w', '?'

]

Sample Input 2

I did, did I?

Sample Output 2

[ 'I', ' ', 'd', 'i', ',', '?' ]

String Starts or Ends with given String

Given an array

stringsArray of strings, and startString, endString as inputs, write a JS program to filter the strings in stringsArray starting with startString or ending with endString.

Quick Tip

You can use the array method filter() and logical operator OR ( || ).

Input

• The first line of input contains a string stringsArray
• The second line of input contains a string startString
• The third line of input contains a number endString

Output

• The output should be a single line containing an array of filtered strings

Sample Input 1

['teacher', 'friend', 'cricket', 'farmer', 'rose', 'talent', 'trainer']

t

r

Sample Output 1

[ 'teacher', 'farmer', 'talent', 'trainer' ]

Sample Input 2

['dream', 'player', 'read', 'write', 'trend']

p

d

Sample Output 2

[ 'player', 'read', 'trend' ]

String Slicing

Given two strings

inputString and subString as inputs, write a JS program to slice the inputString if it includes the subString. Slice the inputString starting from the subString to the end of the inputString.Input

• The first line of input contains a string inputString
• The second line of input contains a string subString

Output

• The output should be a sliced string or inputString (if the inputString does not include the subString)

Sample Input 1

JavaScript

S

Sample Output 1

Script

Sample Input 2

Language

air

Sample Output 2

Language

Split and Replace

Given three strings

inputString, separator and replaceString as inputs. Write a JS program to split the

inputString with the given separator and replace strings in the resultant array with the replaceString whose length is greater than 7.

Quick Tip

• You can use the string method split()
• You can use the array method map()

Input

• The first line of input contains a string inputString
• The second line of input contains a string separator
• The third line of input contains a string replaceString

Output

• The output should be a single line containing the strings separated by a space

Sample Input 1

JavaScript-is-amazing

-

Programming

Sample Output 1

Programming is amazing

Mobile

You are given an incomplete

Mobile class.A Mobile object created using the

Mobile class should have the properties like brand, ram, battery, isOnCall, and song.Implement the

Mobile class to initialize the mentioned properties and add the following methods,

Method:

charging

Description: When this method is called, it should set the value of the battery to 100, if the battery is already 100 then log "Mobile Fully Charged" and call removeCharging

method:

removeCharging

Description:

It should log "Please remove charging"

method:

playMusic

Description:

It should log a text with the song, as shown in the sample output.

method:

stopMusic

Description:

It should log "Music Stopped"

method:

makeCall

Description:

When this method is called, it should set the value of the isOnCall to true and log "Calling ..."

method:

endCall

Description:

When this method is called, it should log "No ongoing call to end" if isOnCall is false, else log "Call Ended" and set the value of the isOnCall to false

Input

• The first line of input contains a string brand
• The second line of input contains a string ram
• The third line of input contains a number battery
• The fourth line of input contains a string song
• The fifth line of input contains a boolean isOnCall

Output

• The first line of output is a string containing
• battery before charging, as shown in the sample outputs
• The second line of output is a string based on
• battery, as shown in the sample outputs
• The third line of output is a string containing
• song, as shown in the sample outputs
• The fourth line of output is a string "Music stopped"
• The fifth line of output is a string "No ongoing call to end" or "Call Ended"
• The sixth line of output is a string "Calling..."
• The seventh line of output is a string "Call Ended"

Constraints

0 <=

battery <= 100

sample input

Apple

2 GB

90

Waka Waka

false

sample output

Mobile charged 90%

Mobile charged 100%

Playing Waka Waka song

Music stopped

No ongoing call to end

Calling...

Call Ended

Mobile

You are given an incomplete

Mobile class.A Mobile object created using the

Mobile class should have the properties like brand, ram, battery, isOnCall, and song.Implement the

Mobile class to initialize the mentioned properties and add the following methods,

MethodDescriptionchargingWhen this method is called, it should set the value of the battery to 100, if the battery is already 100 then log "Mobile Fully Charged" and call removeChargingremoveChargingIt should log "Please remove charging"playMusicIt should log a text with the song, as shown in the sample outputstopMusicIt should log "Music Stopped"makeCallWhen this method is called, it should set the value of the isOnCall to true and log "Calling ..."endCallWhen this method is called, it should log "No ongoing call to end" if isOnCall is false, else log "Call Ended" and set the value of the isOnCall to false

Input

• The first line of input contains a string brand
• The second line of input contains a string ram
• The third line of input contains a number battery
• The fourth line of input contains a string song
• The fifth line of input contains a boolean isOnCall

Output

• The first line of output is a string containing
• battery before charging, as shown in the sample outputs
• The second line of output is a string based on
• battery, as shown in the sample outputs
• The third line of output is a string containing
• song, as shown in the sample outputs
• The fourth line of output is a string "Music stopped"
• The fifth line of output is a string "No ongoing call to end" or "Call Ended"
• The sixth line of output is a string "Calling..."
• The seventh line of output is a string "Call Ended"

Constraints

0 <=

battery <= 100

Write a program that will ask the user to enter a number less than 256 and print out the value of the

number expressed in binary.

Allison takes a trip to a “Cent Store” where all items cost less than one dollar and she purchases one

item. Ask for the cost of the item in cents. Remember that the cost will be less than one dollar.

Display the minimum number of coins needed to make change for Allison’s purchase from one dollar.

Also display the number of each type of coin. (Possible coins are pennies, nickels, dimes, and

quarters.)

The class Object defines an equals() method to compare objects.

Specify the advantages and disadvantages of using this method and suggest an alternative for equality