What are the differences between standard Pascal and modern Pascal?

- Modern Pascal uses more securities and fewer ambiguities while programming or coding. Whereas, Standard Pascal have been using less security and more ambiguity while programming or coding.

- Modern Pascal provides backward compatibility by the use of functions and procedures with their parameters. Whereas, standard Pascal doesn’t provide this kind approach and doesn’t follow the backward compatibility.

- Modern Pascal provides Var parameters to be used with the procedures and functions and make advancement over the standard Pascal.

- Modern Pascal provides the definitive type of compatibility with its parameters and the symbols used. Whereas, standard Pascal doesn’t provide anything related to the symbols.

- Modern Pascal allows the removal of the length of the symbol that is limited. Whereas, standard Pascal doesn’t remove the symbol length limit.