(ans=='y' || ans== 'Y')

[masiht]

what does II do in this statement ?

[wretch]

it's should be 2 vertical bars || and it means OR in C or C++ (it is a logical operator). The statement is true if ans equals 'y' or ans equals 'Y' (the user might type in lower or upper case) so allow both as yes answers.

[rossipoo]

This is actually not the letter I. I forget the name of the character, but it is usually found on the keyboard near backspace. This is c++'s OR operator. In this case, if the user types either a capital Y, or a lowercase y, the program will accept both characters as an afirmation.

[Zaita]

| is called a pipe.