Could you edit your orig. post to sort out the formatting. In particular the indenting (of scopes). It's quite hard to read at the mo'.
But from what I can see through the "murk"...
#1 a is not inititlized (to 0), so it's been incremented from an unknown value.
suggestion: use single declaration per line to make this clearer
#2 main should return int (a void return is non-standard)
#3 you only need one loop. replace your two by a single one
|these two loops will repeat equally|
Not true! To start with, the second loop is incrementing when it should be decrementing!
But when j-- is used instead of j++, it is still not right as the j loop is nested inside the i loop. If you log the comparisons made, you will see it tries (for "hello")
i = 0, j = 4
i = 0, j = 3
i = 0, j = 2
i = 1, j = 4
i = 1, j = 3
i = 1, j = 2
i = 2, j = 4
i = 2, j = 3
i = 2, j = 2
which is not what you need here!
#4 the point you say it's palindrome is not right: you only know it it is one at the end of the loop(s)
#5 your input code looks unnecessarily complicated. see
And while I was at it, I'd give some of you variables better names!