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Answer Friends can be either functions or other classes The class grants friends unlimited access privileges * The declaration of the function should be preceded by the keyword 'friend' * The function definition will not use the keyword or the scope operator '' Thus, a friend function is an ordinary function or a member of another classThe predecessors of C used the " auto " to declare variables Back in the days there was a lot of code that had to be ported to the new C language Adding the keyword to the language was of help in that case C and "auto" Many programmers use compilers that can compile both C and C code, like for example Microsoft's Visual StudioC Keywords Keywords are predefined, reserved words used in programming that have special meanings to the compiler Keywords are part of the syntax and they cannot be used as an identifier For example int money; Keywords In C C Tutorial What are keywords in c