C is not completely portable.
Neither is any other language.
FORTRAN was described as being as portable as
syphilis.
At the time, FORTRAN was about as good as it got for portability.
Today? C is quite possibly the most widely portable language there is.
(I feel reasonably sure there are more machines with C but not FORTRAN
than the other way around.)
Next month? Next year? Next decade? Sorry, my crystal ball is foggy.
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