public/subjects/options.en.md

options

Instructions

Write a program that takes an undefined number of arguments which could be considered as options and writes on the standard output a representation of those options as groups of bytes followed by a newline ('\n').

• An option is an argument that begins with a - and that can have multiple characters which could be : -abcdefghijklmnopqrstuvwxyz

• All options are stocked in a single int and each options represents a bit of that int, and should be stocked like this :

  	- 00000000 00000000 00000000 00000000
  	- ******zy xwvutsrq ponmlkji hgfedcba
  

• Launching the program without arguments or with the -h flag activated must print all the valid options on the standard output, as shown on one of the following examples.

• A wrong option must print Invalid Option followed by a newline.

Usage

student@ubuntu:~/[[ROOT]]/test$ go build
student@ubuntu:~/[[ROOT]]/test$ ./test | cat -e
options: abcdefghijklmnopqrstuvwxyz$
student@ubuntu:~/[[ROOT]]/test$ ./test -abc -ijk | cat -e
00000000 00000000 00000111 00000111$
student@ubuntu:~/[[ROOT]]/test$ ./test -z | cat -e
00000010 00000000 00000000 00000000$
student@ubuntu:~/[[ROOT]]/test$ ./test -abc -hijk | cat -e
options: abcdefghijklmnopqrstuvwxyz$
student@ubuntu:~/[[ROOT]]/test$ ./test -h | cat -e
options: abcdefghijklmnopqrstuvwxyz$
student@ubuntu:~/[[ROOT]]/test$ ./test -zh | cat -e
options: abcdefghijklmnopqrstuvwxyz$
student@ubuntu:~/[[ROOT]]/test$ ./test -z -h | cat -e
options: abcdefghijklmnopqrstuvwxyz$
student@ubuntu:~/[[ROOT]]/test$ ./test -% | cat -e
Invalid Option$
student@ubuntu:~/[[ROOT]]/test$