what are RECURSIONS....???

Can Anyone Tell Me What Are Recursions....??
What For It Is Used....??
& What Is Call By Reference Or Call By Value....???

Someone can, yes. Interestingly enough, if you type recursion in C (without quotes) into Google and hit "I'm Feeling Lucky", you'll get a page that talks, not just about recursion, but about call by reference and call by value as well!

Recursion means that the function calls itself over and over until it finishes its task.
Pass by value means an argument passed to a function is copied (a copy is made), pass by reference or how I like to call, pass by pointer, means the address of the argument is passed so the function can modify the original argument.

No, No, No, you're all wrong!

Re-curseions are where you've already cursed at the ions, and now, you're cursing at the ions, again!

Poor ions. Everybody hates a charged particle, I guess!

recursions in C man not in phY....!!