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## isnegative
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### Instructions
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Write a function that prints `'T'` (true) on a single line if the `int` passed as parameter is negative, otherwise it prints `'F'` (false).
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### Expected function
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```go
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func IsNegative(nb int) {
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}
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```
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### Usage
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Here is a possible program to test your function :
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```go
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package main
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import "piscine"
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func main() {
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piscine.IsNegative(1)
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piscine.IsNegative(0)
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piscine.IsNegative(-1)
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}
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```
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And its output :
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```console
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$ go run .
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F
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F
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T
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$
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```
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