Given real numbers a, b, c. Find the roots of the quadratic equation ax2 + bx + c = 0, otherwise the answer is to say that there are no roots.

Given real numbers x, y, z. Find out if there is a triangle with sides x, y, z.

Three real numbers are given. To square those of them whose values are nonnegative.

The program asks the user “How old are you?”. You enter a positive number to 100. The program should give a complete answer to "You X (or years or years or year).

Given real numbers a, b, c. Double these numbers if a≥b≥c, and replace them with absolute values, if it is not.

Given a natural number n (n≥9999). Is this number a palindrome (a flip-flop) with four digits, such as 2222, 6116, 0440, etc.?