Good evening to everyone. I have some troubles with a task I have to do. I need some assistance. Excuse me if I haven't searched thoroughly in the forum and there is a similar topic somewhere. Thank you!

**Here's the issue:**

Compute the minimal and the maximal value of function f(x,y) obtained on an integer point in a given rectangle [a, b] x [c, d]. The program should prompt the user to input numerical values of a, b, c and d, as floating point numbers, which are expected to be in a range from -100 thru 100. In case when minimal or maximal values do not exists, your program should output appropriate messages.

Send the source code of your program together with the calculated integer values of x and y for which f(x,y) reaches its minimum and maximum on [a, b] x [c, d].

My case:

16. a=5, b=7, c=1, d=20, f(x,y)=(x+1)/(y-1);

I'm really stuck and I don't know what exactly to do. I'll be very thankful if you give me some clues. Thank you one more time!