Tasks studies - laboratory
Write a program that reads three integers from standard input and prints their average to standard output.
Write a program that reads an integer from standard input and prints a number with an absolute value of seven, but with the opposite sign of the entered number.
Write a program that reads an integer n from standard input and prints [sqrt(n)] (the whole of the square root of n, i.e. the largest integer less than or equal to the square root of n).
Write a program that, for a natural number n entered by the user, calculates the nth term of the sequence given by the formula:
An = 4 when n = 1 or n = 2
3a(n-1)+7a(n-2)-2 otherwise
Use the function for this purpose.
Write a program that creates a 2n-element array for an entered n-element array (e.g. named array) in such a way that the first element of the array array becomes the first element of the created array, the second element of the array array becomes the third element of the created array, the third element of the array array becomes the fifth element of the created array, etc. The remaining elements of the created array will take the value 1. The value n > 1 and the elements of the output array are provided by the user.