A Laboratory Course in C++, 5th Edition

substring exceeds the number of characters in the object string. substr(17, 23) asks

for a substring of length 23 beginning at position 17. There are only 38 characters in

the string TITLE, so this request cannot be fulfilled. In this case, the rest of the object

string is returned beginning at position 17. The seventh line of output prints the length

of the string returned (21). What happens if the beginning position is outside the

string? The program crashes.

The eighth line of output is the result of applying the at function to TITLE

(TITLE.at(4)), which returns the character in the fourth position of the string.

We said that there are five useful ...