WATFOR and WATFIV (variously, Waterloo FORTRAN or Waterloo FORTRAN IV), developed in Canada at the University of Waterloo, are implementations of the Fortran computer programming language, intended for educational use.WATFOR was the original version. WATFIV was a successor version used from the late 1960s into the mid-1980s. WATFIV was in turn succeeded by later versions of WATFOR.

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