everest% cc fib2.c -o fib2
everest% fib2 1
Fib(1) = 1
everest% fib2 2
Fib(2) = 2
everest% fib2 3
Fib(3) = 3
everest% fib2 4
Fib(4) = 5
everest% fib2 5
Fib(5) = 8
everest% fib2 9
Fib(9) = 55
everest% fib2 10
Fib(10) = 89
everest% fib2 17
Fib(17) = 2584
everest% fib2 24
Fib(24) = 75025
everest% fib2 35
Fib(35) = 14930352
everest% fib2 42
Fib(42) = 433494437
everest% 

everest% time fib2 35
Fib(35) = 14930352
0.0u 0.0s 0:00 100% 0+0k 0+0io 0pf+0w
everest% 

everest% time fib2 42
Fib(42) = 433494437
0.0u 0.0s 0:00 100% 0+0k 0+0io 0pf+0w
everest% quit    
everest%