Delphi Edit box help

Hi, I have some calculations on Delphi program I made. Check attached procedure. If I delete values from edTemp box, I get error message. I allready did alphabet letter blocking. But how I prevent errors when field is empty. One solution could be that if field is empty then "temp" variable gets value 25. But I don't know what kind of IF command line should I make. Other words : All I need on that event is : if user somehow manages to make edTemp input field EMPTY then variable called "temp" value is replaced with 25 value. Easy. BR, Harri ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request. 3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement). ## Platform Delphi