C string find

std::string::npos npos is a static member constant value with the greatest possible value for an element of type size_t . This value, when used as the value for a len (or sublen) parameter in string’s member functions, means “until the end of the string”. As a return value, it is usually used to indicate no matches.

The find() method returns the index of the first occurence of a substring in the given string (case-sensitive ). If the substring is not found it returns -1.

Compare Two Strings Ignoring the Case in C++

Comparing strings in a case insensitive manner means to compare them without taking care of the uppercase and lowercase letters. To perform this operation the most preferred method is to use either toUpperCase() or toLowerCase() function . toUpperCase() function: The str.