Basic defensive programming [duplicate]

Question

Possible Duplicate:
Favorite (Clever) Defensive Programming Best Practices

I am always advised by some programmers to pay concentration to easy debugging. What is defensive programming and to which extend should it be considered while practicing?

And one more important question: is there any key things to consider while coding and what are they?

Answer 1

Have a look at

• Defensive programming
• Case Study – Defensive Programming
• The art of defensive programming

Defensive programming is the idea that the developer makes as few assumptions as absolutely necessary. In addition, the developer preemptively creates code that anticipates not only potential problems but also specification changes.