What is the fibonacci function in c programming?

the fibonacci sequence is the first number, beginning with 1 and adding the previous number.


ie: 1 1 2 3 5 8 ...


1


1 + 1 = 2


1 + 2 = 3


2 + 3 = 5


3 + 5 = 8...

What is the fibonacci function in c programming?
long fib_num(long n)


{


long low(0), high(1);





while (n--) {


high += low;


low = high - low;


}





return low;

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