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Fix Fibonacci sequence i.e. fib(0) -> 0. (#1996)

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related Issue #1985
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Jannis Imhof 2024-04-15 22:07:44 +02:00 committed by GitHub
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2 changed files with 5 additions and 6 deletions
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7
src/types-and-values/exercise.md
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@ -4,16 +4,15 @@ minutes: 15
# Exercise: Fibonacci
The first and second Fibonacci numbers are both `1`. For n>2, the n'th Fibonacci
number is calculated recursively as the sum of the n-1'th and n-2'th Fibonacci
numbers.
The Fibonacci sequence begins with `[0,1]`. For n>1, the n'th Fibonacci number
is calculated recursively as the sum of the n-1'th and n-2'th Fibonacci numbers.
Write a function `fib(n)` that calculates the n'th Fibonacci number. When will
this function panic?
```rust,editable,should_panic
{{#include exercise.rs:fib}}
if n <= 2 {
if n < 2 {
// The base case.
todo!("Implement this")
} else {

4
src/types-and-values/exercise.rs
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@ -16,8 +16,8 @@
// ANCHOR: fib
fn fib(n: u32) -> u32 {
// ANCHOR_END: fib
if n <= 2 {
return 1;
if n < 2 {
return n;
} else {
return fib(n - 1) + fib(n - 2);
}