Overloading +, +=Operators
		• If the + operator is overloaded, we should also overload the += operator • The + operator can take either a string or a char * as the first or second operands, so we will overload it as a non- member friend and support the following: – string + char *,   char * + string,  string + string • For the += operator, the first operand must be a string object, so we will overload it as a member • The + operator results in a string as an rvalue temp • The += operator results in a string as an lvalue • The + operator doesn’t modify either operand, so string object should be passed as constant references