Use of strlen(a) in palindromic string

#1

why here sir uses strlen(a)-1 but not strlen(a) as strlen(a) gives the length of the string and points at the last index??

#2

hi rahul,
sir used strlen(a)-1 because indexing of string is also from 0.
e.g.
abcba
01234
This will be the indexing of the string.
Please let me know if there is any other doubt.

#3

ok so strlen(a) gives us the index of null character in char a[] ??

#4

hi @rahulkumarraj220,
Yes it gives index of null char.