KBruch is a small program to practice calculating with fractions. Therefor
4 different exercises are offered.

1. Exercise Fraction Task - in this exercise you have to solve a given
   fraction task. You have to enter numerator and denominator. This is the main
   exercise. The difficulty of this task can be influenced by the user. The user
   can decide if he wants to solve tasks with addition/substraction and/or
   multiplication/division. Also he can set the number of fractions and the maximum
   size of the main denominator.


2. Exercise Comparison - in this exercise you have to compare the size of 2
   given fractions.


3. Exercise Conversion - in this exercise you have to convert a given number
   into a fraction.


4. Exercise Factorization - in this exercise you have to factorize a given
   number into its prime factors. Factorization is important while finding the main
   denominator of 2 fractions.