这个的输出过程不太明白
这个程序的输出过程感觉看的不是特别明白，我怎么算都是9而不是8
fib(1) = 1
fib(2) = 1
fib(3) = fib(2) + fib(1) = 2
fib(4) = fib(3) + fib(2) = 3
fib(5) = fib(4) + fib(3) = 5
fib(6) = fib(5) + fib(4) = 8
fib(1) = 1
fib(2) = 1
fib(3) = fib(2) + fib(1) = 2
fib(4) = fib(3) + fib(2) = 3
fib(5) = fib(4) + fib(3) = 5
fib(6) = fib(5) + fib(4) = 8