In this app you can make assignment to some string and use them later. You can make four basic operations and addition to that you take power of number. App uses BigInteger so you can work with long numbers. App checks every exceptions and cares about process priority.
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Assignment: "what ever you want without spaces" = 10
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Command: You can write /help or /exit. Help, writes what the app does. Exit, stops the app.
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Expression: As you read this app can do 5 operations also you can use parentheses and you can do long operations.