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## get-area
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### Instructions
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Write a program that takes a positive number as radius and prints the area of a circle.
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- The area of the circle is `3.14` times the radius squared.
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- Only positive numbers will be accepted, otherwise print `Error` followed by (`'\n'`)
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- If the number of arguments is not `1` print (`'\n'`)
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- The output must be an integer.
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### Usage
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```console
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$ go run . | cat -e
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$
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$ go run . 10 | cat -e
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314$
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$ go run . 4 | cat -e
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50$
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$ go run . -10 | cat -e
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Error$
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$ go run . "Hello World!" | cat -e
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Error$
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```
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