new exercises exam 2020 afonso

subjects/findprevprime.en.md

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+## findprevprime
+
+## **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 returns the first prime number that is equal or inferior to the `int` passed as parameter.
+
+If there are no primes inferior to the `int` passed as parameter the function should return 0.
+
+### Expected function
+
+```go
+func FindPrevPrime(nb int) int {
+
+}
+```
+
+### Usage
+
+Here is a possible [program](TODO-LINK) to test your function :
+
+```go
+package main
+
+import (
+	"fmt"
+)
+
+func main() {
+	fmt.Println(FindPrevPrime(5))
+	fmt.Println(FindPrevPrime(4))
+}
+```
+
+And its output :
+
+```console
+student@ubuntu:~/piscine-go/test$ go build
+student@ubuntu:~/piscine-go/test$ ./test
+5
+3
+student@ubuntu:~/piscine-go/test$
+```

subjects/grouping.en.md

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+## grouping
+
+### Instructions
+
+Write a program that receives two strings and replicates the use of brackets in regular expressions. Brackets in regular expressions returns the words that contain the expression inside of it.
+
+The program should handle the "`|`" operator, that searches for both strings on each side of the operator.
+
+The output of the program should be the results of the regular expression by order of appearence in the string, being themselves identified by a number.
+
+In case the regular expression is not valid, the last argument is empty or there are no matches the program returns a newline ("`\n`").
+
+If there are more than 2 or no arguments the program should print a newline ("`\n`").
+
+### Usage
+
+```console
+student@ubuntu:~/[[ROOT]]/test$ go build
+student@ubuntu:~/[[ROOT]]/test$ ./regbrackets "(a)" "I'm heavy, jumpsuit is on steady, Lighter when I'm lower, higher when I'm heavy"
+1: heavy
+2: steady
+3: heavy
+student@ubuntu:~/[[ROOT]]/test$ ./regbrackets "(e|n)"f "I currently have 4 windows open up… and I don’t know why."
+1: currently
+2: currently
+3: have
+4: windows
+5: open
+6: open
+7: and
+8: don’t
+9: know
+student@ubuntu:~/[[ROOT]]/test$ ./regbrackets "(hi)" "He swore he just saw his sushi move."
+1: his
+2: sushi
+student@ubuntu:~/[[ROOT]]/test$ ./regbrackets "(s)" ""
+
+student@ubuntu:~/[[ROOT]]/test$ ./regbrackets "i" "Something in the air"
+
+student@ubuntu:~/[[ROOT]]/test$

subjects/piglatin.en.md

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+## piglatin
+
+### Instructions
+
+Write a **program** that transforms a string passed as argument in its `Pig Latin` version.
+
+The rules used by Pig Latin are as follows:
+
+- If a word begins with a vowel, just add "ay" to the end.
+- If it begins with a consonant, then we take all consonants before the first vowel and we put them on the end of the word and add "ay" at the end.
+
+If the word has no vowels the program should print "No vowels".
+
+If the number of arguments is different from one, the program prints a new line.
+
+### Usage
+
+```console
+student@ubuntu:~/student/test$ go build
+student@ubuntu:~/student/test$ ./piglatin
+
+student@ubuntu:~/student/test$ ./piglatin pig | cat -e
+igpay$
+student@ubuntu:~/student/test$ ./piglatin Is | cat -e
+Isay$
+student@ubuntu:~/student/test$ ./piglatin crunch | cat -e
+unchcray$
+student@ubuntu:~/student/test$ ./piglatin crnch | cat -e
+No vowels$
+student@ubuntu:~/student/test$ ./piglatin something else | cat -e
+$
+```

subjects/slice.en.md

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+## slice
+
+## **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 **program** that replicates the javascript functions `slice`.
+
+The program receives an array of strings and one or more integers, and returns an array of strings. The returned array is part of the received one but cut from the position indicated in the first int, until the position indicated by the second int. 
+
+In case there only exists one int, the resulting array begins in the position indicated by the int and ends at the end of the received array.  
+
+The ints can be lower than 0.
+
+### Expected function
+
+```go
+func Slice(arr []string, nbrs... int) []string{
+
+}
+```
+
+
+### Usage 
+
+Here is a possible program to test your function :
+
+```go
+package main
+
+import "fmt"
+
+func main(){
+    arr := []string{"coding", "algorithm", "ascii", "package", "golang"}
+    fmt.Println(arr, 1)
+    fmt.Println(arr, 2, 4)
+    fmt.Println(arr, -3)
+    fmt.Println(arr, -2, -1)
+    fmt.Println(arr, 2, 0)
+}
+```
+
+```console
+student@ubuntu:~/student/test$ go build
+student@ubuntu:~/student/test$ ./test
+[algorithm ascii package golang]
+[ascii package]
+[algorithm ascii package golang]
+[package]
+[]
+```