why my code is giving size more than my input string?

Question

https://code.sololearn.com/cpsJU308T6Xa/#cpp
suppose my input is hello ,now it consists of 5 characters.when i call the reversed.size() it outputs 6 why?Am i using wrong function ?

Answer 1

@Shobhit it's probably because the size method returns the length of the string including the null terminator, hence it gives length+1.

Hth, cmiiw

Answer 2

This is simply because you used += on the new string.
You see, the string constructor, when called during creation, does not allocate an empty string. Instead, it assigns 1 to your string. (Atleast here on Sololearn it works like this.).

Thus, to save the data, you should initialize reversal with "" or clear it.
Eg : string reversal = ""; reversal.clear();

If this doesn't work, Try reducing the initial variable to str.length() -1. It seems the loop is copying some variable that doesn't yet exist. Maybe a '\0'...

This will solve your problem...

Answer 3

@Ipang
No, size and length are direct synonyms, and both return the same thing :

www.cplusplus.com/reference/string/string/size