In customary FORTRAN 77, the sizes of the entire objects are obliged to be recognized at accumulate time (This does not be appropriate to the sizes of formal arguments to subprograms, merely to those of the authentic arguments). This is not convenient for numerous submission, as it means that the program might have encompassed to be recompiled previous to it be able to be run by means of a dissimilar tribulations size. Several operating environments let the user distribute contiguous blocks of memory whose sizes are resolute at run time. Numerous implementations of FORTRAN 77 hold up and maintain an extension ("Cray pointers") that permits programs to create utilize of this facility.
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