What is recursion explain with example?

Recursion is when a function (procedure) calls itself.
Example:

int Fib (int n)
{
if ((n==1)(n==0))return 1;
else return Fib(n-1) + Fib(n-2);
}
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Explain events in VB with an example?

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In Physics

Explain the process of refraction and an example?

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