public/subjects/brackets.en.md

brackets

Instructions

Write a program that takes an undefined number of strings in arguments. For each argument, the program prints on the standard output "OK" followed by a newline if the expression is correctly bracketed, otherwise it prints "Error" followed by a newline.

Symbols considered as brackets are brackets ( and ), square brackets [ and ]and braces { and }. Every other symbols are simply ignored.

An opening bracket must always be closed by the good closing bracket in the correct order. A string which do not contains any bracket is considered as a correctly bracketed string.

If there is no arguments, the program must print only a newline.

Examples of outputs :

student@ubuntu:~/student/test$ go build
student@ubuntu:~/student/test$ ./test '(johndoe)' | cat -e
OK$
student@ubuntu:~/student/test$ ./test '([)]' | cat -e
Error$
student@ubuntu:~/student/test$ ./test '' '{[(0 + 0)(1 + 1)](3*(-1)){()}}' | cat -e
OK$
OK$
student@ubuntu:~/student/test$ ./test | cat -e
$
student@ubuntu:~/student/test$