Check for overflows in fibonacci calculator
This commit is contained in:
Timothy Warren
parent
8fa802e1f7
commit
48b731f8fa
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@ -47,6 +47,12 @@
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||||
<caret line="9" selection-start-line="9" selection-end-line="9" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/add/add-one/src/lib.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="240">
|
||||
<caret line="15" lean-forward="true" selection-start-line="15" selection-end-line="15" />
|
||||
<folding>
|
||||
<element signature="e#30#31#0" expanded="true" />
|
||||
<element signature="e#40#41#0" expanded="true" />
|
||||
<element signature="e#87#88#0" expanded="true" />
|
||||
<element signature="e#123#124#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/smart_pointers/src/lib.rs" />
|
||||
<entry file="file://$PROJECT_DIR$/smart_pointers/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="256">
|
||||
<caret line="16" column="4" selection-start-line="16" selection-start-column="4" selection-end-line="16" selection-end-column="4" />
|
||||
<folding>
|
||||
<element signature="e#68#69#0" expanded="true" />
|
||||
<element signature="e#91#92#0" expanded="true" />
|
||||
<element signature="e#200#201#0" expanded="true" />
|
||||
<element signature="e#351#352#0" expanded="true" />
|
||||
<element signature="e#433#434#0" expanded="true" />
|
||||
<element signature="e#244#245#0" expanded="true" />
|
||||
<element signature="e#261#262#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/reference_counting/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="448">
|
||||
<caret line="28" lean-forward="true" selection-start-line="28" selection-end-line="28" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/interior_mutability/src/lib.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="679">
|
||||
<caret line="55" column="69" selection-start-line="55" selection-start-column="69" selection-end-line="55" selection-end-column="69" />
|
||||
<folding>
|
||||
<element signature="e#1104#1105#0" expanded="true" />
|
||||
<element signature="e#1144#1145#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/reference_cycles/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="768">
|
||||
|
|
@ -449,26 +404,7 @@
|
|||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/twelve_days_of_christmas/Cargo.toml">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="32">
|
||||
<caret line="2" column="13" selection-start-line="2" selection-start-column="13" selection-end-line="2" selection-end-column="13" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/oop/src/lib.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="720">
|
||||
<caret line="45" lean-forward="true" selection-start-line="45" selection-end-line="45" />
|
||||
<folding>
|
||||
<element signature="e#510#511#0" expanded="true" />
|
||||
<element signature="e#537#538#0" expanded="true" />
|
||||
<element signature="e#956#957#0" expanded="true" />
|
||||
<element signature="e#992#993#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/twelve_days_of_christmas/Cargo.toml" />
|
||||
<entry file="file://$PROJECT_DIR$/gui/Cargo.toml">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="112">
|
||||
|
|
@ -494,19 +430,6 @@
|
|||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/blog/src/lib.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="672">
|
||||
<caret line="42" column="1" selection-start-line="42" selection-start-column="1" selection-end-line="42" selection-end-column="1" />
|
||||
<folding>
|
||||
<element signature="e#240#241#0" expanded="true" />
|
||||
<element signature="e#268#269#0" expanded="true" />
|
||||
<element signature="e#656#657#0" expanded="true" />
|
||||
<element signature="e#699#700#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/blog/Cargo.toml">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="112">
|
||||
|
|
@ -514,13 +437,6 @@
|
|||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/blog/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="208">
|
||||
<caret line="13" selection-start-line="13" selection-end-line="13" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/pattern_matching/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="2752">
|
||||
|
|
@ -528,13 +444,6 @@
|
|||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/unsafe_blocks/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="448">
|
||||
<caret line="28" column="50" selection-start-line="28" selection-start-column="50" selection-end-line="28" selection-end-column="50" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/advanced_lifetimes/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="304">
|
||||
|
|
@ -680,17 +589,6 @@
|
|||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/hello/src/lib.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="400">
|
||||
<caret line="25" column="39" selection-start-line="25" selection-start-column="39" selection-end-line="25" selection-end-column="39" />
|
||||
<folding>
|
||||
<element signature="e#194#195#0" expanded="true" />
|
||||
<element signature="e#211#212#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/hello/src/bin/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="768">
|
||||
|
|
@ -698,13 +596,7 @@
|
|||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/twelve_days_of_christmas/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="752">
|
||||
<caret line="47" selection-start-line="47" selection-end-line="47" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/twelve_days_of_christmas/src/main.rs" />
|
||||
<entry file="file://$PROJECT_DIR$/loops/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="944">
|
||||
|
|
@ -731,10 +623,106 @@
|
|||
<entry file="file://$PROJECT_DIR$/ftoc/src/main.rs" />
|
||||
<entry file="file://$PROJECT_DIR$/factorial/src/main.rs" />
|
||||
<entry file="file://$PROJECT_DIR$/fibonacci/Cargo.toml" />
|
||||
<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" />
|
||||
<entry file="file://$PROJECT_DIR$/__non-book-expirements__/old_lady_who_swallowed_a_fly/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="1184">
|
||||
<caret line="74" lean-forward="true" selection-start-line="74" selection-end-line="74" />
|
||||
<state relative-caret-position="896">
|
||||
<caret line="56" column="8" selection-start-line="56" selection-start-column="8" selection-end-line="56" selection-end-column="8" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/__non-book-expirements__/twelve_days_of_christmas/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="272">
|
||||
<caret line="17" column="37" selection-start-line="17" selection-start-column="37" selection-end-line="17" selection-end-column="37" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/__non-book-expirements__/ftoc/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="320">
|
||||
<caret line="22" lean-forward="true" selection-start-line="22" selection-end-line="22" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/__non-book-expirements__/ctof/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="320">
|
||||
<caret line="22" lean-forward="true" selection-start-line="22" selection-end-line="22" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/structs/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="624">
|
||||
<caret line="39" lean-forward="true" selection-start-line="39" selection-end-line="39" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/unsafe_blocks/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="960">
|
||||
<caret line="60" column="4" selection-start-line="60" selection-start-column="4" selection-end-line="60" selection-end-column="4" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/blog/src/lib.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="528">
|
||||
<caret line="35" lean-forward="true" selection-start-line="35" selection-end-line="35" />
|
||||
<folding>
|
||||
<element signature="e#240#241#0" expanded="true" />
|
||||
<element signature="e#268#269#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/blog/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="208">
|
||||
<caret line="13" selection-start-line="13" selection-end-line="13" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/lifetimes/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="864">
|
||||
<caret line="56" selection-start-line="56" selection-end-line="56" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/oop/src/lib.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="688">
|
||||
<caret line="45" lean-forward="true" selection-start-line="45" selection-end-line="45" />
|
||||
<folding>
|
||||
<element signature="e#956#957#0" expanded="true" />
|
||||
<element signature="e#992#993#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/hello/src/lib.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="-47">
|
||||
<caret line="25" column="39" selection-start-line="25" selection-start-column="39" selection-end-line="25" selection-end-column="39" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/adder/src/lib.rs">
|
||||
<provider selected="true" editor-type-id="text-editor" />
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/__non-book-expirements__/factorial/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="1008">
|
||||
<caret line="63" selection-start-line="63" selection-end-line="63" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/__non-book-expirements__/fibonacci/src/main.rs">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="896">
|
||||
<caret line="56" column="35" selection-start-line="56" selection-start-column="35" selection-end-line="56" selection-end-column="35" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
|
|
|
|||
|
|
@ -3,23 +3,29 @@ extern crate separator;
|
|||
use separator::Separatable;
|
||||
|
||||
use std::io;
|
||||
use std::u128;
|
||||
|
||||
///! Calculate a number in the fibonnacci sequence,
|
||||
///! using a lookup table for better worst-case performance.
|
||||
///
|
||||
/// 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) {
|
||||
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 => {
|
||||
let a = n - 1;
|
||||
let b = n - 2;
|
||||
let a = fibonacci(n - 1, table)
|
||||
.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);
|
||||
|
||||
table.insert(n, current);
|
||||
if let Some(current) = attempt {
|
||||
table.insert(n, current);
|
||||
}
|
||||
|
||||
current
|
||||
attempt
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -44,9 +50,16 @@ fn main() {
|
|||
Err(_) => break, // Exit on non-number
|
||||
};
|
||||
|
||||
let calculated = fibonacci(index, &mut table);
|
||||
|
||||
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.");
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue