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hyeon-zhyeon-z
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Merge pull request #1 from hyeon-z/hyeon-z
feat: 계산기 구현
2 parents d46ad09 + 983947b commit b06aaab

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‎.gitattributes‎

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#
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# https://help.github.com/articles/dealing-with-line-endings/
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#
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# Linux start script should use lf
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/gradlew text eol=lf
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# These are Windows script files and should use crlf
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*.bat text eol=crlf
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‎.gitignore‎

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# Created by https://www.toptal.com/developers/gitignore/api/java,gradle,intellij+all
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# Edit at https://www.toptal.com/developers/gitignore?templates=java,gradle,intellij+all
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### Intellij+all ###
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# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
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# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
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# User-specific stuff
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.idea/**/workspace.xml
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.idea/**/tasks.xml
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.idea/**/usage.statistics.xml
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.idea/**/dictionaries
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.idea/**/shelf
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# AWS User-specific
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.idea/**/aws.xml
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# Generated files
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.idea/**/contentModel.xml
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# Sensitive or high-churn files
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.idea/**/dataSources/
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.idea/**/dataSources.ids
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.idea/**/dataSources.local.xml
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.idea/**/sqlDataSources.xml
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.idea/**/dynamic.xml
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.idea/**/uiDesigner.xml
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.idea/**/dbnavigator.xml
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# Gradle
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.idea/**/gradle.xml
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.idea/**/libraries
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# Gradle and Maven with auto-import
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# When using Gradle or Maven with auto-import, you should exclude module files,
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# since they will be recreated, and may cause churn. Uncomment if using
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# auto-import.
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# .idea/artifacts
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# .idea/compiler.xml
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# .idea/jarRepositories.xml
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# .idea/modules.xml
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# .idea/*.iml
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# .idea/modules
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# *.iml
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# *.ipr
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# CMake
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cmake-build-*/
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# Mongo Explorer plugin
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.idea/**/mongoSettings.xml
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# File-based project format
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*.iws
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# IntelliJ
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out/
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# mpeltonen/sbt-idea plugin
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.idea_modules/
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# JIRA plugin
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atlassian-ide-plugin.xml
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# Cursive Clojure plugin
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.idea/replstate.xml
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# SonarLint plugin
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.idea/sonarlint/
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# Crashlytics plugin (for Android Studio and IntelliJ)
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com_crashlytics_export_strings.xml
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crashlytics.properties
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crashlytics-build.properties
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fabric.properties
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# Editor-based Rest Client
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.idea/httpRequests
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# Android studio 3.1+ serialized cache file
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.idea/caches/build_file_checksums.ser
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### Intellij+all Patch ###
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# Ignore everything but code style settings and run configurations
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# that are supposed to be shared within teams.
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.idea/*
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!.idea/codeStyles
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!.idea/runConfigurations
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### Java ###
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# Compiled class file
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*.class
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# Log file
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*.log
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# BlueJ files
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*.ctxt
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# Mobile Tools for Java (J2ME)
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.mtj.tmp/
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# Package Files #
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*.jar
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*.war
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*.nar
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*.ear
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*.zip
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*.tar.gz
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*.rar
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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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hs_err_pid*
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replay_pid*
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### Gradle ###
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.gradle
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**/build/
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!src/**/build/
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# Ignore Gradle GUI config
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gradle-app.setting
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# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
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!gradle-wrapper.jar
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# Avoid ignore Gradle wrappper properties
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!gradle-wrapper.properties
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# Cache of project
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.gradletasknamecache
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# Eclipse Gradle plugin generated files
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# Eclipse Core
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.project
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# JDT-specific (Eclipse Java Development Tools)
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.classpath
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### Gradle Patch ###
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# Java heap dump
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*.hprof
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# End of https://www.toptal.com/developers/gitignore/api/java,gradle,intellij+all

‎app/build.gradle‎

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/*
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* This file was generated by the Gradle 'init' task.
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*
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* This generated file contains a sample Java application project to get you started.
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* For more details take a look at the 'Building Java & JVM projects' chapter in the Gradle
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* User Manual available at https://docs.gradle.org/8.1.1/userguide/building_java_projects.html
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*/
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plugins {
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// Apply the application plugin to add support for building a CLI application in Java.
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id 'application'
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}
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repositories {
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// Use Maven Central for resolving dependencies.
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mavenCentral()
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}
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dependencies {
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// Use JUnit Jupiter for testing.
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testImplementation 'org.junit.jupiter:junit-jupiter:5.9.1'
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testImplementation "org.assertj:assertj-core:3.11.1"
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// This dependency is used by the application.
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implementation 'com.google.guava:guava:31.1-jre'
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}
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// Apply a specific Java toolchain to ease working on different environments.
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java {
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toolchain {
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languageVersion = JavaLanguageVersion.of(11)
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}
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}
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application {
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// Define the main class for the application.
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mainClass = 'java.calculator.Main'
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}
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tasks.named('test') {
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// Use JUnit Platform for unit tests.
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useJUnitPlatform()
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}

‎app/src/main/java/Main.java‎

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/*
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* This Java source file was generated by the Gradle 'init' task.
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*/
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import calculator.Calculator;
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import java.io.IOException;
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public class Main {
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public static void main(String[] args) throws IOException {
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Calculator calculator = new Calculator();
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calculator.run();
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}
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}

‎app/src/main/java/Print/Choice.java‎

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package Print;
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public class Choice {
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public static void printChoice() {
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System.out.println("0. 종료");
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System.out.println("1. 조회");
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System.out.println("2. 계산");
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System.out.println();
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System.out.print("선택: ");
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}
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}

‎app/src/main/java/calculator/Calculator.java‎

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package calculator;
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import function.Calculation;
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import function.Storage;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStreamReader;
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import static Print.Choice.printChoice;
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import static validator.Validator.checkChoiceNum;
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public class Calculator {
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public void run() throws IOException {
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BufferedReader br;
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Storage storage = new Storage();
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Calculation calculation = new Calculation();
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while (true) {
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printChoice();
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br = new BufferedReader(new InputStreamReader(System.in));
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int choice = checkChoiceNum(Integer.parseInt(br.readLine()));
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System.out.println();
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if (choice == 0) {
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break;
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} else if (choice == 1) {
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System.out.println(storage.print());
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} else {
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br = new BufferedReader(new InputStreamReader(System.in));
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String expression = br.readLine();
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String result = convertByType(calculation.calculatePostfix(calculation.convertPostfix(expression)));
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storage.store(expression + " = " + result);
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System.out.println(result);
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System.out.println();
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}
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}
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}
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private String convertByType(double result) {
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if (result == (int) result) {
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return String.valueOf((int) result);
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}
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return String.valueOf(result);
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}
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}

‎app/src/main/java/function/Calculation.java‎

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package function;
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import operator.Operator;
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import java.util.Stack;
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import static validator.Validator.checkPositiveNum;
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import static validator.Validator.checkValidOperator;
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public class Calculation {
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private static int priority(char operator) {
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if (operator == '(' || operator == ')') {
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return 0;
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} else if (operator == '+' || operator == '-') {
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return 1;
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} else if (operator == '*' || operator == '/') {
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return 2;
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}
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return -1;
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}
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public String convertPostfix(String expression) {
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Stack<Character> stack = new Stack<>();
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StringBuilder sb = new StringBuilder();
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String[] split = expression.split(" ");
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for (String now : split) {
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if (checkPositiveNum(now)) {
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sb.append(now).append(" ");
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continue;
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}
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char c = checkValidOperator(now.charAt(0));
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switch (c) {
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case '(':
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stack.add(c);
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break;
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case ')':
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while (!stack.isEmpty() && !(stack.peek() == '(')) {
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sb.append(stack.pop()).append(" ");
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}
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stack.pop();
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break;
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default:
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while (!stack.isEmpty() && priority(stack.peek()) >= priority(c)) {
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sb.append(stack.pop()).append(" ");
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}
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stack.add(c);
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break;
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}
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}
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while (!stack.isEmpty()) {
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sb.append(stack.pop()).append(" ");
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}
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return sb.toString();
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}
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public double calculatePostfix(String postfix) {
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String[] pfs = postfix.split(" ");
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Stack<String> stack = new Stack<>();
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Operator operator = new Operator();
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for (String pf : pfs) {
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if (checkPositiveNum(pf)) {
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stack.add(pf);
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continue;
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}
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char op = pf.charAt(0);
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double numEnd = Double.parseDouble(stack.pop());
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double numFront = Double.parseDouble(stack.pop());
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String result = "";
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switch (op) {
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case '+':
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result = String.valueOf(operator.add(numFront, numEnd));
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break;
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case '-':
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result = String.valueOf(operator.subtract(numFront, numEnd));
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break;
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case '*':
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result = String.valueOf(operator.multiply(numFront, numEnd));
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break;
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case '/':
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result = String.valueOf(operator.divide(numFront, numEnd));
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break;
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}
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stack.add(result);
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}
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return Double.parseDouble(stack.pop());
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}
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}

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