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26 lines
630 B
26 lines
630 B
2 years ago
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## get-area
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### instructions
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- Write a program that takes a number and prints the area of the circle.
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- The area of the circle is `π` times the radius squared.
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- if the number is not positive or is not a number, print `Error` followed by (`'\n'`)
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- if the number is positive, print the area of the circle followed by (`'\n'`)
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- if the number of arguments is not `1` print (`'\n'`)
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- You may assume that the value of `π` is 3.14
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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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315$
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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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