new exercises for exam

subjects/chunk.en.md

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+## chunk
+
+## **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 called `Chunk` that receives as parameters a slice, `slice []int`, and an number `size int`. The goal of this function is to chunk a slice into many sub slices where each sub slice has the length of `size`.
+
+- If the `size` is `0` it should print `\n`
+
+### Expected function
+
+```go
+func Chunk(slice []int, size int) {
+
+}
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+func main() {
+	Chunk([]int{}, 10)
+	Chunk([]int{0, 1, 2, 3, 4, 5, 6, 7}, 0)
+	Chunk([]int{0, 1, 2, 3, 4, 5, 6, 7}, 3)
+	Chunk([]int{0, 1, 2, 3, 4, 5, 6, 7}, 5)
+	Chunk([]int{0, 1, 2, 3, 4, 5, 6, 7}, 4)
+}
+```
+
+And its output :
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ go build
+student@ubuntu:~/[[ROOT]]/test$ ./test
+[]
+
+[[0 1 2] [3 4 5] [6 7]]
+[[0 1 2 3 4] [5 6 7]]
+[[0 1 2 3] [4 5 6 7]]
+student@ubuntu:~/[[ROOT]]/test$
+```

subjects/reduceint.en.md

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+## reduceint
+
+## **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 called `reduceint` that simulates the behaviour of reduce from JavaScript.
+
+The function should have as parameters a function, `f func(int, int) int` and a slice of integers, `slice []int`. You should apply for each element of the slice the arithmetic function, saving it and printing.
+
+### Expected function
+
+```go
+func ReduceInt(f func(int, int) int, slice []int) {
+
+}
+```
+
+### Usage
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+func main() {
+	mul := func(acc int, cur int) int {
+		return acc * cur
+	}
+	sum := func(acc int, cur int) int {
+		return acc + cur
+	}
+	div := func(acc int, cur int) int {
+		return acc / cur
+	}
+	as := []int{500, 2}
+	ReduceInt(mul, as)
+	ReduceInt(sum, as)
+	ReduceInt(div, as)
+}
+
+```
+
+And its output :
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ go build
+student@ubuntu:~/[[ROOT]]/test$ ./test
+1000
+502
+250
+student@ubuntu:~/[[ROOT]]/test$
+```

subjects/romannumbers.en.md

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+## romannumbers
+
+### Instructions
+
+Write a program called `rn`. The objective is to converte a number, given has argument, into a roman number and print it with roman number calculation.
+
+The program should have a limit of `4000`. In case of an invalid number, for example `"hello"` or  `0` the program should print `ERROR: can not convert to roman digit`.
+
+## Usage
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ go build
+student@ubuntu:~/[[ROOT]]/test$ ./rn hello
+ERROR: can not convert to roman digit
+student@ubuntu:~/[[ROOT]]/test$ ./rn 123
+C+X+X+I+I+I
+CXXIII
+student@ubuntu:~/[[ROOT]]/test$ ./rn 999
+(M-C)+(C-X)+(X-I)
+CMXCIX
+student@ubuntu:~/[[ROOT]]/test$ ./rn 3999
+M+M+M+(M-C)+(C-X)+(X-I)
+MMMCMXCIX
+student@ubuntu:~/[[ROOT]]/test$ ./rn 4000
+ERROR: can not convert to roman digit
+student@ubuntu:~/[[ROOT]]/test$
+```