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