Add recursive fibonnachi example
This commit is contained in:
Timothy Warren
parent
396dde530e
commit
497ca00d24
1
.idea/misc.xml
generated
1
.idea/misc.xml
generated
@ -45,6 +45,7 @@
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||||
<cargoProject FILE="$PROJECT_DIR$/pancakes/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/hello/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/old_lady_who_swallowed_a_fly/Cargo.toml" />
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<cargoProject FILE="$PROJECT_DIR$/fibonacci/Cargo.toml" />
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<component name="ComposerJsonPluginSettings">
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<unboundedVersionInspectionSettings>
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5
.idea/rust.iml
generated
5
.idea/rust.iml
generated
@ -181,6 +181,10 @@
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<sourceFolder url="file://$MODULE_DIR$/old_lady_who_swallowed_a_fly/examples" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/old_lady_who_swallowed_a_fly/tests" isTestSource="true" />
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||||
<sourceFolder url="file://$MODULE_DIR$/old_lady_who_swallowed_a_fly/benches" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/fibonacci/src" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/fibonacci/examples" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/fibonacci/tests" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/fibonacci/benches" isTestSource="true" />
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<excludeFolder url="file://$MODULE_DIR$/add/add-one/target" />
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<excludeFolder url="file://$MODULE_DIR$/add/adder/target" />
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<excludeFolder url="file://$MODULE_DIR$/adder/target" />
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@ -194,6 +198,7 @@
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<excludeFolder url="file://$MODULE_DIR$/ctof/target" />
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<excludeFolder url="file://$MODULE_DIR$/enums/target" />
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<excludeFolder url="file://$MODULE_DIR$/errors/target" />
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<excludeFolder url="file://$MODULE_DIR$/fibonacci/target" />
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<excludeFolder url="file://$MODULE_DIR$/ftoc/target" />
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<excludeFolder url="file://$MODULE_DIR$/functions/target" />
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<excludeFolder url="file://$MODULE_DIR$/generics/target" />
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133
.idea/workspace.xml
generated
133
.idea/workspace.xml
generated
@ -14,11 +14,38 @@
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</component>
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<component name="FileEditorManager">
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<leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
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<file pinned="false" current-in-tab="true">
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<file pinned="false" current-in-tab="false">
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<entry file="file://$PROJECT_DIR$/old_lady_who_swallowed_a_fly/src/main.rs">
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<provider selected="true" editor-type-id="text-editor">
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<state relative-caret-position="768">
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</entry>
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</file>
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<file pinned="false" current-in-tab="true">
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<entry file="file://$PROJECT_DIR$/fibonacci/src/main.rs">
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<provider selected="true" editor-type-id="text-editor">
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<state relative-caret-position="192">
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</entry>
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</file>
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<file pinned="false" current-in-tab="false">
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<entry file="file://$PROJECT_DIR$/fibonacci/Cargo.toml">
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<provider selected="true" editor-type-id="text-editor">
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</entry>
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</file>
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<file pinned="false" current-in-tab="false">
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<entry file="file://$PROJECT_DIR$/guessing_game/src/main.rs">
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</provider>
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</entry>
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@ -56,12 +83,15 @@
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<find>expensive_closure(intensity)</find>
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<find>ordinals</find>
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<find>///</find>
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<find>u128</find>
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<find>u64</find>
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</findStrings>
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<replaceStrings>
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<replace>f_to_c</replace>
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<replace>expensive_result.value(intensity)</replace>
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<replace>ORDINALS</replace>
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<replace>//!</replace>
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<replace>u128</replace>
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</replaceStrings>
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</component>
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<component name="Git.Settings">
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@ -70,8 +100,6 @@
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<component name="IdeDocumentHistory">
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<option name="CHANGED_PATHS">
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<list>
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<option value="$PROJECT_DIR$/minigrep/src/main.rs" />
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<option value="$PROJECT_DIR$/closures/src/main.rs" />
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<option value="$PROJECT_DIR$/closures/src/lib.rs" />
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<option value="$PROJECT_DIR$/minigrep_v2/src/main.rs" />
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<option value="$PROJECT_DIR$/minigrep_v2/src/lib.rs" />
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@ -121,6 +149,8 @@
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<option value="$PROJECT_DIR$/hello/src/lib.rs" />
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<option value="$PROJECT_DIR$/hello/src/bin/main.rs" />
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<option value="$PROJECT_DIR$/old_lady_who_swallowed_a_fly/src/main.rs" />
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<option value="$PROJECT_DIR$/fibonacci/Cargo.toml" />
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<option value="$PROJECT_DIR$/fibonacci/src/main.rs" />
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</list>
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</option>
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</component>
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@ -131,10 +161,10 @@
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<other-services-enabled>false</other-services-enabled>
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</component>
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||||
<component name="ProjectFrameBounds" extendedState="6">
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<option name="x" value="1680" />
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<option name="y" value="370" />
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||||
<option name="width" value="1050" />
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<option name="height" value="877" />
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<option name="x" value="1987" />
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<option name="y" value="-7" />
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<option name="width" value="1080" />
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<option name="height" value="1057" />
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</component>
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<component name="ProjectLevelVcsManager" settingsEditedManually="true">
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||||
<ConfirmationsSetting value="1" id="Add" />
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@ -177,12 +207,23 @@
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<path>
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<item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
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<item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
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<item name="loops" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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<item name="fibonacci" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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</path>
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<path>
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<item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
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<item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
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<item name="loops" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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<item name="fibonacci" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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<item name="src" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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</path>
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<path>
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<item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
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<item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
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<item name="guessing_game" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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</path>
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<path>
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<item name="rust" type="3d21c010:ScopeViewTreeModel$ProjectNode" />
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<item name="rust" type="2674bda8:ScopeViewTreeModel$GroupNode" />
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<item name="guessing_game" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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<item name="src" type="9f88c78c:ScopeViewTreeModel$FileNode" />
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</path>
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<path>
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@ -215,7 +256,7 @@
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</component>
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<component name="PropertiesComponent">
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<property name="JavaScriptWeakerCompletionTypeGuess" value="true" />
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<property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1549991319219" />
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<property name="com.android.tools.idea.instantapp.provision.ProvisionBeforeRunTaskProvider.myTimeStamp" value="1550777495454" />
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<property name="javascript.nodejs.core.library.configured.version" value="7.1.0" />
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<property name="js.eslint.eslintPackage" value="$USER_HOME$/.yarn-config/global/node_modules/.bin/eslint" />
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<property name="js.eslint.nodeInterpreter" value="project" />
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@ -249,7 +290,7 @@
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</list>
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</option>
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</component>
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<component name="RunManager" selected="Cargo Command.Run old_lady_who_swallowed_a_fly">
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<component name="RunManager" selected="Cargo Command.Run fibonacci">
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<configuration name="<template>" type="TestNG" default="true" selected="false">
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<option name="MAIN_CLASS_NAME" />
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<option name="VM_PARAMETERS" value="-ea" />
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@ -278,13 +319,13 @@
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<envs />
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<method v="2" />
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</configuration>
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<configuration name="Run advanced_types" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<configuration name="Run fibonacci" type="CargoCommandRunConfiguration" factoryName="Cargo Command" temporary="true">
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<option name="channel" value="DEFAULT" />
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<option name="command" value="run --package advanced_types --bin advanced_types" />
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<option name="command" value="run --package fibonacci --bin fibonacci" />
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<option name="allFeatures" value="false" />
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<option name="nocapture" value="false" />
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<option name="backtrace" value="SHORT" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/advanced_types" />
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<option name="workingDirectory" value="file://$PROJECT_DIR$/fibonacci" />
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<envs />
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<method v="2" />
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</configuration>
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@ -327,11 +368,11 @@
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</configuration>
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<recent_temporary>
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<list>
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<item itemvalue="Cargo Command.Run fibonacci" />
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<item itemvalue="Cargo Command.Run old_lady_who_swallowed_a_fly" />
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<item itemvalue="Cargo Command.Run hello" />
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<item itemvalue="Cargo Command.Run pancakes" />
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<item itemvalue="Cargo Command.Run advanced_functions" />
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<item itemvalue="Cargo Command.Run advanced_types" />
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</list>
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</recent_temporary>
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</component>
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@ -368,11 +409,11 @@
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</history-entry>
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<frame x="1920" y="-438" width="1080" height="1897" extended-state="6" />
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<editor active="true" />
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<layout>
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<window_info content_ui="combo" id="Project" order="0" sideWeight="0.49522156" visible="true" weight="0.26141885" />
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<window_info id="Structure" order="1" sideWeight="0.50477844" side_tool="true" visible="true" weight="0.26141885" />
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<window_info active="true" content_ui="combo" id="Project" order="0" sideWeight="0.49524873" visible="true" weight="0.2540132" />
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<window_info id="Structure" order="1" sideWeight="0.50475127" side_tool="true" visible="true" weight="0.2540132" />
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<window_info id="Image Layers" order="2" />
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<window_info id="Designer" order="3" />
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<window_info id="Capture Tool" order="4" />
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@ -380,7 +421,7 @@
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||||
<window_info id="Cargo" order="6" sideWeight="0.49791494" weight="0.3286119" />
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<window_info anchor="bottom" id="Message" order="0" />
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<window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
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<window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
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@ -402,27 +443,6 @@
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||||
<option name="version" value="1" />
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</component>
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<component name="editorHistoryManager">
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<entry file="file://$PROJECT_DIR$/minigrep/src/lib.rs">
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</entry>
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||||
<entry file="file://$PROJECT_DIR$/closures/src/main.rs">
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||||
<provider selected="true" editor-type-id="text-editor">
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<state relative-caret-position="1120">
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||||
@ -715,9 +735,7 @@
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</state>
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</provider>
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</entry>
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<entry file="file://$PROJECT_DIR$/macros/src/main.rs">
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<provider selected="true" editor-type-id="text-editor" />
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||||
</entry>
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||||
<entry file="file://$PROJECT_DIR$/macros/src/main.rs" />
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<entry file="file://$PROJECT_DIR$/hello_macro/Cargo.toml">
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||||
<provider selected="true" editor-type-id="text-editor">
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<state relative-caret-position="112">
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||||
@ -803,6 +821,13 @@
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||||
</state>
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||||
</provider>
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</entry>
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<entry file="file://$PROJECT_DIR$/old_lady_who_swallowed_a_fly/src/main.rs">
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</state>
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</entry>
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<entry file="file://$PROJECT_DIR$/twelve_days_of_christmas/src/main.rs">
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<provider selected="true" editor-type-id="text-editor">
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<state relative-caret-position="752">
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@ -810,6 +835,13 @@
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<entry file="file://$PROJECT_DIR$/guessing_game/src/main.rs">
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<entry file="file://$PROJECT_DIR$/loops/src/main.rs">
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<provider selected="true" editor-type-id="text-editor">
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@ -817,10 +849,17 @@
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</entry>
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||||
<entry file="file://$PROJECT_DIR$/old_lady_who_swallowed_a_fly/src/main.rs">
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<entry file="file://$PROJECT_DIR$/fibonacci/Cargo.toml">
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<entry file="file://$PROJECT_DIR$/fibonacci/src/main.rs">
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<provider selected="true" editor-type-id="text-editor">
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|
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|
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|
||||
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||||
8
fibonacci/Cargo.toml
Normal file
8
fibonacci/Cargo.toml
Normal file
@ -0,0 +1,8 @@
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[package]
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name = "fibonacci"
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version = "0.1.0"
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authors = ["Timothy Warren <twarren@nabancard.com>"]
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edition = "2018"
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[dependencies]
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separator = "0.4.0"
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52
fibonacci/src/main.rs
Normal file
52
fibonacci/src/main.rs
Normal file
@ -0,0 +1,52 @@
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extern crate separator;
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use separator::Separatable;
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use std::io;
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///! Calculate a number in the fibonnacci sequence,
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///! using a lookup table for better worst-case performance.
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///
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/// Can calculate up to 186 using native unsigned 128 bit integers.
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fn fibonacci(n: usize, table: &mut Vec<u128>) -> u128 {
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match table.get(n) {
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Some(x) => *x, // Vec<T>.get returns a Option with a reference to the value, so deref
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None => {
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let a = n - 1;
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let b = n - 2;
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let current = fibonacci(a, table) + fibonacci(b, table);
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table.insert(n, current);
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current
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||||
}
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||||
}
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||||
}
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||||
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||||
fn main() {
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// The lookup table for previously calculated values
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let mut table: Vec<u128> = vec![0, 1, 1, 2, 3, 5];
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||||
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||||
println!("Fibonacci calculator.");
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println!("Any non-number will exist.");
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||||
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||||
loop {
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||||
println!("\nWhich index in the sequence to calculate?");
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||||
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||||
let mut index = String::new();
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||||
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||||
io::stdin().read_line(&mut index)
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||||
.expect("Failed to read line");
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||||
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||||
let index = match index.trim().parse() {
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||||
Ok(num) => num,
|
||||
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());
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user