public/subjects/strlenprog.en.md

## strlenprog

## **WARNING! VERY IMPORTANT!**

For this exercise a function will be tested **with the exam own main**. However the student **still needs** to submit a structured program:

This means that:

- The package needs to be named `package main`.
- The submitted code needs one declared function main(```func main()```) even if empty.
- The function main declared needs to **also pass** the `Restrictions Checker`(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
- Every other rules are obviously the same than for a `program`.

### Instructions

- Write a function that counts the `runes` of a `string` and that returns that count.

### Expected function

```go
func StrLen(str string) int {

}
```

### Usage

Here is a possible program to test your function :

```go
package main

import (
	"fmt"
)

func main() {
	str := "Hello World!"
	nb := StrLen(str)
	fmt.Println(nb)
}
```

And its output :

```console
student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test
12
student@ubuntu:~/[[ROOT]]/test$
```