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Functions

Design Issues:

• Are side effects allowed?
  • Two-way parameters (Ada does not allow)
  • Nonlocal reference (all allow)

• What types of return values are allowed?
  • FORTRAN, Pascal, Modula-2: only simple types
  • C: any type except functions and arrays
  • Ada: any type (but subprograms are not types)
  • C++ and Java: like C, but also allow classes to be returned