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Check for overflows in fibonacci calculator

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This commit is contained in:
Timothy Warren 2019-02-26 13:52:31 -05:00
parent 8fa802e1f7
commit 48b731f8fa
4 changed files with 236 additions and 199 deletions
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@ -449,26 +404,7 @@
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@ -698,13 +596,7 @@
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<entry file="file://$PROJECT_DIR$/factorial/src/main.rs" /> <entry file="file://$PROJECT_DIR$/factorial/src/main.rs" />
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<entry file="file://$PROJECT_DIR$/old_lady_who_swallowed_a_fly/src/main.rs"> <entry file="file://$PROJECT_DIR$/old_lady_who_swallowed_a_fly/src/main.rs" />
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31
__non-book-expirements__/fibonacci/src/main.rs
View File

@ -3,23 +3,29 @@ extern crate separator;
use separator::Separatable; use separator::Separatable;
use std::io; use std::io;
use std::u128;
///! Calculate a number in the fibonnacci sequence, ///! Calculate a number in the fibonnacci sequence,
///! using a lookup table for better worst-case performance. ///! using a lookup table for better worst-case performance.
/// ///
/// Can calculate up to 186 using native unsigned 128 bit integers. /// Can calculate up to 186 using native unsigned 128 bit integers.
fn fibonacci(n: usize, table: &mut Vec<u128>) -> u128 { fn fibonacci(n: usize, table: &mut Vec<u128>) -> Option<u128> {
match table.get(n) { match table.get(n) {
Some(x) => *x, // Vec<T>.get returns a Option with a reference to the value, so deref Some(x) => Some(*x), // Vec<T>.get returns a Option with a reference to the value, so deref
None => { None => {
let a = n - 1; let a = fibonacci(n - 1, table)
let b = n - 2; .unwrap_or(u128::MAX);
let b = fibonacci(n - 2, table)
.unwrap_or(u128::MAX);
let current = fibonacci(a, table) + fibonacci(b, table); // Check for overflow when adding
let attempt = a.checked_add(b);
if let Some(current) = attempt {
table.insert(n, current); table.insert(n, current);
}
current attempt
} }
} }
} }
@ -44,9 +50,16 @@ fn main() {
Err(_) => break, // Exit on non-number Err(_) => break, // Exit on non-number
}; };
let calculated = fibonacci(index, &mut table);
println!("Calculating number for index: {}", index); println!("Calculating number for index: {}", index);
println!("The Fibonnacci number at index: {} is {}", index, calculated.separated_string());
match fibonacci(index, &mut table) {
Some(calculated) => {
println!("The Fibonacci number at index: {} is {}", index, calculated.separated_string());
},
None => {
println!("Calculation overflow. The factorial base was too large.");
}
}
} }
} }