Write a Java program that will ask the user for a starting number, ending number, and a decrement number. The program will then count down, from the starting number down to and including the ending number, by the decrement number, displaying each number on a separate line. Also, for each displayed number, the program will say whether the number is even or odd. This program will require the use of the "while" loop as well as an "if/else" statement. Examine the sample outputs carefully in order to structure your code in a logical manner. This program will require the use of the "while" loop as well as the "if/else" statement. Examine the sample outputs carefully in order to structure your code in a logical manner. Remember... pseudo code is your friend. Work on 1 part at a time. Notes: Carefully read and adhere to coding standards – pay particular attention to the use of braces and indentation Choose meaningful identifiers for all variables and constants Use blank lines here and there to separate logical steps in your code Add comments to document your code. Comments are not optional and must be included. Use a one-line comment before each block to describe what you are doing – don't describe the code syntax, but rather the purpose of the code. These comments should effectively describe the steps in your "algorithm." • Spell things carefully, including capitalization, since Java is fussy about that Check your results! Testing your code is IMPORTANT! Here is a sample run of the program: Here is another sample run: What's the start number? What's the start number? 100 What's the end number? What's the end number? What's the number you are decrementing by? What's the number you are decrementing by? 22 The number 5 is odd. The number 4 is even. The number 100 is even. The number 78 is even. The number 3 is odd. The number 56 is even. The number 2 is even. The number 34 is even. The number 1 is odd. The number 12 is even.

Write a complete program to generate a username based on a user's first and last name.  Part One: Get a Valid First and Last Name  ask the user for and read in their first and last name use a loop to validate the first name: it must be at least one character long and it must start with a letter use a loop to validate the last name: it must not contain any spaces Hint: use a nested loop. The outer loop will iterate until there is valid input. The inner loop will check each character in the String to see if any of them are whitespace. Part Two: Generate a Username  generate a two-digit random number (i.e., a random number between 10 and 99, inclusive) create a username that is the following data concatenated: the first letter of their first name in lower case the first five characters of their last name in lower case; if the name is shorter than five characters, use the whole last name the two-digit number output the username to the user Additional Coding Requirements  code…

Please use python language. Write a recursive program to find the sum of first n numbers. sum = 1 +2 + 3 + …….n

ii) Describe the four IP abstraction levels in TCP. ii) Explain a fictitious scenario in which two computers share a video file via an open FTP connection with a weak TCP three-way handshake.

Write a program that asks the user to enter a signed number and read it. Then display the content of multiplying this number by 24.5