Using the less than comparison operator for strings

Question

I\'m following a tutorial for C++ and looking at strings and overloading with operators such as +=, ==, != etc. Currently I have a sim

Answer 1

The comparison operators implement lexicographic ordering of strings.

-= and *= are not defined for strings.

Answer 2

The less-than operator on strings does a lexicographical comparison on the strings. This compares strings in the same way that they would be listed in dictionary order, generalized to work for strings with non-letter characters.

For example:

"a" < "b"
"a" < "ab"
"A" < "a"             (Since A has ASCII value 65; a has a higher ASCII value)
"cat" < "caterpillar"

For more information, look at the std::lexicographical_compare algorithm, which the less-than operator usually invokes.

As for -= and *=, neither of these operators are defined on strings. The only "arithmetic" operators defined are + and +=, which perform string concatenation.

Hope this helps!