Restrictions that are appropriate for changes in programming languages:

There is a requirement for some restriction for changes in programming languages during its evolving phase as follows:

Usually in every version of the language, a new feature is added that will be absolutely absent in its previous version. This should be avoided.

Enhancement of an existing feature can be a good idea.

Adding of new features in new versions make the language large, bulk and complex.

Also, obsolete features should be removed from the revised version. Often this is not done as the existing programs would have used this.

Comparison with the evolution of Fortran:

Fortran 0 was the first Fortran version, but it continued to evolve until its release and finally, Fortran I was released.

Fortran I allowed variable length up to six characters as this was two in Fortran 0...

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Concepts Of Programming Languages

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