My program prints out Fibonacci_number(0,1,1,2,3,5). The program is ok.
My problem:I want to take a number from Fibonacci_number(0,1,1,2,3,5)
and multiply whit 10. ex: I want to take 3 and multiply with 10.
I tried to write another function and call a Fibonacci_number from
fib(int k)and then multiply it whit 10.
How can I call an exact Fibonacci_number.

int fib(int k)
	  int my_nbr=0;
	  int f;
          int  nbr1 = 0;
          int  nbr2 = 1;

      for (f = 2; f < k; ++f)
           printf(",%d", nbr1 + nbr2);

           my_nbr= nbr2;
           nbr2 = nbr2 + nbr1;
           nbr1 = my_nbr;


int main(void)
   return 0;

I am having a difficult time understanding what it is you are asking. But what I think you want is a function that returns the fibonacci number of the value passed to the function, such that
fib(0) = 0
fib(1) = 1
fib(2) = 1
fib(3) = 2
fib(4) = 3
fib(5) = 5
fib(6) = 8So instead of printing the values in the loop, you would want your function to return a value. Hint.