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  • A function is named unit of a group of program statements that can be invoked from other parts of the program.
  • Function helps reduce the program size and avoid ambiguity.
  • C++ makes function prototyping essential.
  • In a function prototype any argument cannot have a default value unless all arguments are appearing on its right have their default values.
  • A function can return no value, integer values and non integer values or reference.
  • C++ provides 2 kinds of scopes namely local and global.
  • The place of function or a variable declared determines its scope.

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