1. Design and implement an application that reads an integer value representing a year input by the user. The purpose of the program is to determine if the year is a leap year (and therefore has 29 days in February) in the Gregorian calendar. A year is a leap year if it is divisible by 4, unless it is also divisible by 100 but not 400. For example, the year 2003 is not a leap year, but 2004 is. The year 1900 is not a leap year because it is divisible by 100, but the year 2000 is a leap year because even though it is divisible by 100, it is also divisible by 400. Produce an error message for any input value less than 1582 (the year the Gregorian calendar was adopted). 2. Modify the solution to the previous project (i.e., Leap year) so that the user can evaluate multiple years. Allow the user to terminate the program using an appropriate sentinel value. Validate each input value to ensure it is greater than or equal to 1582.

(3) Write a C# .NET Core Console App that asks the user to enter a number and then displays a string with the original number followed by the reverse of the number. For example, if the user entered 123 as an int you program should create a string "123321" and display it on the screen

Objective: Must create an interactive program (in C language) in which the computer generates a random number between 1 and 15. The user is presented with a guessing game and must enter their guess as to which number the computer is "thinking of" (the randomly generated number between 1 and 15). The user is limited to five guesses. If the user guesses the correct number within the five guess limit, they win. If the user does not guess correctly within the five guess limit, they lose the game. Following each user input, the output must say "your guess of _ was too low. try again" or "your guess of _ was too high. try again" or "you guessed it!"    Instructions: The program must make use of passing by value and reference, if-else, defined constants, and use of the random number generator/seeding. The seed function srand() should only be called once in main. The point is to demonstrate use of multiple functions (those aforementioned) even though this could be accomplished with a much…

er 6 Functions Programming Exercises te 1. Rectangle Area ngle Area The area of a rectangle is calculated according to the following formula: Area = Width X Length Design a function that accepts a rectangle's width and length as arguments and returns the rectangle's area. Use the function in a program that prompts the user to enter the rectangle's width and length, and then displays the rectangle's area.