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Following is an incorrect pseudocode for the algorithm which is supposed to determine whether a sequence of parentheses is balanced:

declare a character stack 
while ( more input is available) 

read a character 
if ( the character is a '(' ) 
    push it on the stack 
else if ( the character is a ')' and the stack is not empty ) 
    pop a character off the stack 
else
    print "unbalanced" and exit

print "balanced"
 
Q.
which of these unbalanced sequences does the above code think is balanced?
  • a)
    ((())
  • b)
    ())(()
  • c)
    (()()))
  • d)
    (()))()
Correct answer is option 'A'. Can you explain this answer?
Verified Answer
Following is an incorrect pseudocode for the algorithm which is suppos...
At the end of while loop, we must check whether the stack is empty or not. For input ((()), the stack doesn't remain empty after the loop.
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Most Upvoted Answer
Following is an incorrect pseudocode for the algorithm which is suppos...
"Unbalanced parentheses"

The correct pseudocode for the algorithm to determine whether a sequence of parentheses is balanced should be as follows:

1. Declare a character stack
2. While (more input is available):
a. Read a character
b. If (the character is an opening parenthesis '('), push it onto the stack
c. Else if (the character is a closing parenthesis ')') and the stack is not empty, pop a character off the stack
d. Else, print "Unbalanced parentheses" and exit the loop
3. If the stack is empty, print "Balanced parentheses"
4. Else, print "Unbalanced parentheses"
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Following is an incorrect pseudocode for the algorithm which is supposed to determine whether a sequence of parentheses is balanced:declare a character stackwhile ( more input is available){read a characterif ( the character is a '(' ) push it on the stackelse if ( the character is a ')' and the stack is not empty ) pop a character off the stackelse print "unbalanced" and exit}print "balanced"Q.which of these unbalanced sequences does the above code think is balanced?a)((())b)())(()c)(()()))d)(()))()Correct answer is option 'A'. Can you explain this answer?
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