Based on a simple calculator java Android studio, the simple addition and subtraction, multiplication and division operations.

Calculator\.gitignore
..........\..radle\2.2.1\taskArtifacts\cache.properties
..........\.......\.....\.............\cache.properties.lock
..........\.......\.....\.............\fileHashes.bin
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..........\.......\.....\.............\taskArtifacts.bin
..........\.idea\.name
..........\.....\compiler.xml
..........\.....\..pyright\profiles_settings.xml
..........\.....\gradle.xml
..........\.....\inspectionProfiles\profiles_settings.xml
..........\.....\..................\Project_Default.xml
..........\.....\libraries\appcompat_v7_22_2_0.xml
..........\.....\.........\support_annotations_22_2_0.xml
..........\.....\.........\support_v4_22_2_0.xml
..........\.....\misc.xml
..........\.....\modules.xml
..........\.....\vcs.xml
..........\.....\workspace.xml
..........\app\.gitignore
..........\...\app.iml
..........\...\build\generated\source\buildConfig\androidTest\debug\com\apress\gerber\calculator\test\BuildConfig.java
..........\...\.....\.........\......\...........\debug\com\apress\gerber\calculator\BuildConfig.java
..........\...\.....\.........\......\r\debug\android\support\v7\appcompat\R.java
..........\...\.....\.........\......\.\.....\com\apress\gerber\calculator\R.java
..........\...\.....\intermediates\classes\androidTest\debug\com\apress\gerber\calculator\ApplicationTest.class
..........\...\.....\.............\.......\...........\.....\...\......\......\..........\test\BuildConfig.class
..........\...\.....\.............\.......\debug\android\support\v7\appcompat\R$anim.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R$attr.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R$bool.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R$color.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R$dimen.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R$drawable.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R$id.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R$integer.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R$layout.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R$string.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R$style.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R$styleable.class
..........\...\.....\.............\.......\.....\.......\.......\..\.........\R.class
..........\...\.....\.............\.......\.....\com\apress\gerber\calculator\BuildConfig.class
..........\...\.....\.............\.......\.....\...\......\......\..........\MainActivity$1.class
..........\...\.....\.............\.......\.....\...\......\......\..........\MainActivity$CommandAction.class
..........\...\.....\.............\.......\.....\...\......\......\..........\MainActivity$NumberAction.class
..........\...\.....\.............\.......\.....\...\......\......\..........\MainActivity$OperationAction.class
..........\...\.....\.............\.......\.....\...\......\......\..........\MainActivity.class
..........\...\.....\.............\.......\.....\...\......\......\..........\R$anim.class
..........\...\.....\.............\.......\.....\...\......\......\..........\R$attr.class
..........\...\.....\.............\.......\.....\...\......\......\..........\R$bool.class
..........\...\.....\.............\.......\.....\...\......\......\..........\R$color.class
..........\...\.....\.............\.......\.....\...\......\......\..........\R$dimen.class
..........\...\.....\.............\.......\.....\...\......\......\..........\R$drawable.class
..........\...\.....\.............\.......\.....\...\......\......\..........\R$id.class
..........\...\.....\.............\.......\.....\...\......\......\..........\R$integer.cla

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