Programming & Computer Science 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

You are given a square matrix A of dimensions NxN. You need to apply the below given 3 operations on the matrix A.

Rotation: It is represented as R S where S is an integer in {90, 180, 270, 360, 450, ...} which denotes the number of degrees to rotate. You need to rotate the matrix A by angle S in the clockwise direction. The angle of rotation(S) will always be in multiples of 90 degrees.

Update: It is represented as U X Y Z. In initial matrix A (as given in input), you need to update the element at row index X and column index Y with value Z.

After the update, all the previous rotation operations have to be applied to the updated initial matrix.

Querying: It is represented as Q K L. You need to print the value at row index K and column index L of the matrix A. Input

The first line contains a single integer N.

Next N lines contain N space-separated integers Aij (i - index of the row, j - index of the column).

Next lines contain various operations on the array. Each operation on each line (Beginning either with R, U or Q).

-1 will represent the end of input.Output

For each Query operation print the element present at row index K and colum index L of the matrix in its current state.Explanation

For Input:

2

1 2

3 4

R 90

Q 0 0

Q 0 1

R 90

Q 0 0

U 0 0 6

Q 1 1

-1

Initial Matrix

1 2

3 4

For R 90, clockwise rotation by 90 degrees, the matrix will become

3 1

4 2

For Q 0 0, print the element at row index 0 and column index 0 of A, which is 3.

For Q 0 1, print the element at row index 0 and column index 1 of A, which is 1.

Again for R 90, clockwise rotation by 90 degrees, the matrix will become

4 3

2 1

For Q 0 0, print the element at row index 0 and column index 0 of A, which is 4.

For U 0 0 6, update the value at row index 0 and column index 1 in the initial matrix to 6. So the updated matrix will be,

6 2

3 4

After updating, we need to rotate the matrix by sum of all rotation angles applied till now(i.e. R 90 and R 90 => 90 + 90 => 180 degrees in clockwise direction).

After rotation the matrix will now become

4 3

2 6

Next for Q 1 1, print the element at row index 1 and column index 1 of A, which is 6.

output

3

1

4

6

Given a MxN matrix,write a program to print all Anti-Diagonals elements of matrix

Input

The first line of input will contain a M, N values separated by space.

The second line will contain matrix A of dimensions MxN.

Output

The output should contain anti-diagonal elements separated by a line.

Explanation

For example, if M = 4, N = 4

Matrix A:

4 4

1 2 3 4

5 6 7 8

9 10 11 12

13 14 15 16

so the output should be

1

2 5

3 6 9

4 7 10 13

8 11 14

12 15

16

Time Converter from hours and minutes to seconds

Time Converter

In this assignment, let's build a Time Converter by applying the concepts we learned till now.

Refer to the below image.

Instructions:

• The HTML input element for entering the number of hours should have the id hoursInput
• The HTML input element for entering the number of minutes should have the id minutesInput
• Add HTML label elements for HTML input elements with ids hoursInput and minutesInput
• The HTML button element should have the id convertBtn
• The HTML p element to display the converted time in seconds should have the id timeInSeconds
• The HTML p element to display the error message should have the id errorMsg

By following the above instructions, achieve the given functionality.

• When values are entered in HTML input elements with ids hoursInput and minutesInput, the HTML button with id convertBtn is clicked
• The converted time in seconds should be displayed in the HTML p element with id timeInSeconds
• The HTML p element with id errorMsg should be empty
• The HTML p element with id errorMsg should display an error message in the following cases
• When the HTML input element with id hoursInput is empty and convertBtn is clicked
• When the HTML input element with id minutesInput is empty and convertBtn is clicked
• When both the HTML input elements hoursInput and minutesInput are empty and convertBtn is clicked

Quick Tip

• timeInSeconds = ((hours) *60 + minutes) * 60

Note

• The values given for the HTML input elements with ids hoursInput and minutesInput should be positive integers.

Resources

Use this Background image:

• https://assets.ccbp.in/frontend/dynamic-webapps/time-converter-bg.png

CSS Colors used:

Text colors Hex code values used:

#f5f7fa

#000000

#ffffff

CSS Font families used:

• Open Sans