Java Taskbook Level 9.8

Задание 1

Create a program that generates quadratic equations with integer roots.

Задание 2

Implement the bubble sort algorithm.

Задание 3

Given a number, check if this number is perfect.

Задание 4

Given a text file. Get the percentage of each character in the text and write the result to the file so that each line contains the character and its percentage.