GATE CSE 1995 | Question: 2.9

Question

A language with string manipulation facilities uses the following operations

head(s): first character of a string
tail(s): all but exclude the first character of a string

concat(s1, s2): s1s2

For the string "$acbc$" what will be the output of

concat(head(s), head(tail(tail(s))))

• A. $ac$
• B. $bc$
• C. $ab$
• D. $cc$

Comments

i think some correction is required in question
tail(s): all but the EXCLUDE first character of a string

Answer 1

Answer is C.

• $concat(a,head(tail(tail(acbc))))$
• $concat(a,head(tail(cbc)))$
• $concat(a,head(bc))$
• $concat(a,b)$
• $ab$.

Comments

answer should ac???

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@altamash no answer will be  ab

use the tail definition which is given in the question 

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got it

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answer is $ac$ when you take input $abcd$.