Traditional calculator layout used. Should be intuitive for anyone that has experience with fractions and calculators.
Enter number for numerator and use "Over" button to start specifying denominator, use operators to specify calculations.
Make calculations with operators: add, subtract, multiply, divide, square root.
Was first implemented to display fractions as a string, then modified to draw fractions.
Uses shunting yard algorithm.
UI needs more work, there is bugs displaying results of very large numbers.
