a simple android calculator program,use stack to judge the priority

calculator\.classpath
..........\.project
..........\AndroidManifest.xml
..........\bin\calculator.apk
..........\...\.lasses\com\ita\calculator\CalculatorActivity$1.class
..........\...\.......\...\...\..........\CalculatorActivity$2.class
..........\...\.......\...\...\..........\CalculatorActivity.class
..........\...\.......\...\...\..........\R$attr.class
..........\...\.......\...\...\..........\R$drawable.class
..........\...\.......\...\...\..........\R$id.class
..........\...\.......\...\...\..........\R$layout.class
..........\...\.......\...\...\..........\R$string.class
..........\...\.......\...\...\..........\R.class
..........\...\classes.dex
..........\...\res\drawable-hdpi\ic_launcher.png
..........\...\...\.........ldpi\ic_launcher.png
..........\...\...\.........mdpi\ic_launcher.png
..........\...\resources.ap_
..........\gen\com\ita\calculator\R.java
..........\proguard.cfg
..........\project.properties
..........\res\drawable-hdpi\ic_launcher.png
..........\...\.........ldpi\ic_launcher.png
..........\...\.........mdpi\ic_launcher.png
..........\...\layout\main.xml
..........\...\values\strings.xml
..........\src\com\ita\calculator\CalculatorActivity.java
..........\bin\classes\com\ita\calculator
..........\...\.......\...\ita
..........\gen\com\ita\calculator
..........\src\com\ita\calculator
..........\bin\classes\com
..........\...\res\drawable-hdpi
..........\...\...\drawable-ldpi
..........\...\...\drawable-mdpi
..........\gen\com\ita
..........\src\com\ita
..........\bin\classes
..........\...\res
..........\gen\com
..........\res\drawable-hdpi
..........\...\drawable-ldpi
..........\...\drawable-mdpi
..........\...\layout
..........\...\values
..........\src\com
..........\assets
..........\bin
..........\gen
..........\res
..........\src
calculator

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