Programming & Computer Science Answers

Write a program that takes a String

through Command Line argument and display the length of

the string. Also display the string into uppercase and check whether it is a palindrome or not.

Write a class to represent dates (i.e., day/month/year). Add methods that should perform operations such as determining the number of days between two dates, add two dates, determining the number of months between two dates and determining the day of the week that a particular date falls on. Write a test class to confirm that your date class works.

a program which get the value of three numbers x, y and z from user and check whether x and y are equal and greater than z

10.Subtract every elements in 2D array a2d with 1d array b1d, such that the first row’s elements of a2d subtracts the first element of b1d, the second row’s elements of a2d subtract the second element of b1d and the third row’s elements of a2d subtract the third element of b1d.

a2d = np.array([[10,10,10],[11,11,11],[12,12,12]])

b1d = np.array([2,3,4])

Answer:

Output:

array([[8, 8, 8],

       [8, 8, 8],

       [8, 8, 8]])

7.Write a code to get the positions where elements of array a and array b are same

a = np.array(['a','b','c','b','c','d','c','d','e','f'])

b = np.array(['g','b','j','b','g','d','i','d','i','h'])

Answer:

Output:

(array([1, 3, 5, 7], dtype=int64),)

8.List the items which are present in array a but NOT present in array b

a = np.array(['a','b','c','d','e'])

b = np.array(['c','d','e','f','g'])

Answer:

array(['a', 'b'], dtype='<U1')

9.Reverse the sequence of rows in 2-D array

a = np.arange(16).reshape(4,4)

Answer:

Output:

array([[12, 13, 14, 15],

    [ 8, 9, 10, 11],

    [ 4, 5, 6, 7],

    [ 0, 1, 2, 3]])

4.Convert a 1-D array into a 2-D array

a = np.array(['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l'])

Answer:

Output:

array([['a', 'b', 'c'],

    ['d', 'e', 'f'],

    ['g', 'h', 'i'],

    ['j', 'k', 'l']], dtype='<U1')

5.Add 101 to all the values in given array

a = np.arange(16).reshape(4,-1)

Answer:

Output:

array([[101, 102, 103, 104],

    [105, 106, 107, 108],

    [109, 110, 111, 112],

    [113, 114, 115, 116]])

6.Extract the last 5 columns of this 2-D array

a = np.arange(100).reshape(5,-1)

Answer:

Output:

array([[15, 16, 17, 18, 19],

    [35, 36, 37, 38, 39],

    [55, 56, 57, 58, 59],

    [75, 76, 77, 78, 79],

    [95, 96, 97, 98, 99]])

1.Convert the 1-D array to 3-D array

a = np.array([x for x in range(32)])

Answer:

print(o)

Output:

array([[[ 0, 1, 2, 3, 4, 5, 6, 7],

    [ 8, 9, 10, 11, 12, 13, 14, 15]],

    [[16, 17, 18, 19, 20, 21, 22, 23],

    [24, 25, 26, 27, 28, 29, 30, 31]]])

2.Convert the value in the array to appropriate data type

a = np.array([[7.2, 5.4, 9.3],

       [3.8, 6.7, 8.5]])

Answer:

print(o)

Output:

[[7 5 9]

 [3 6 8]]

3.Extract value in between 7 to 15 from the given array

a = np.array([2, 6, 1, 9, 10, 3, 27])

Answer:

print(o)

Output:

[ 8 12 9 11]

In the IPv4 Header format following information is given in decimal number system, with

respect to the given information calculate the header checksum value. (10)

VER=4

HLEN =6

Service type=9

Total length=26

Identification=2

Flag=3

Fragmentation offset=0

Time to live=5

Protocol=12

Source IP Address=11.13.12.6

Destination IP Address=10.6.8.11

Find the first address, last address and the number of addresses of a network whose one

of the IP addresses is 50.28.22.75 / 25.

(5 marks question).

Mention and explain each field of IPv4 header in detail, by taking suitable examples.

(5 marks)