Explanation: In the above program, s1 is declared as a string object that is initialized with the
string “C plus plus.” The member function find_last_of() searches for the character p and
when its last occurrence is found, it returns the element number of the previous character.
18.8 COMPARING AND EXCHANGING
The string class contains functions that enable the programmer to compare and exchange the
strings. The related functions are illustrated below with suitable examples:
compare()
The member function compare() is used to compare two strings or sub-strings. It returns
0 when the two strings are similar; otherwise,
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