DECUS Heritage

Version: V6, May 1981
Submitted By: Digital Equipment Corporation
Operating System: VAX/VMS
Source Language: MACRO-32, FORTRAN IV
Keywords: Calculators, Mathematical
Memory Requirements: Approximately 249 peak virtual pages.

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Abstract: CALC is a calculator designed to evaluate arithmetic expressions. In its basic form, expression evaluation is similar to that used by ANSI FORTRAN with calculations performed on INTEGER*4 and REAL*8 constants. Variables are limited to single alphabetic characters. Additional features include octal, hexadecimal, and multiple precision arithmetic capabilities. Commonly used commands and expressions can be placed in a file and executed when convenient. It is assumed that the reader is familiar with FORTRAN data types, constants, expression syntax, operator precedence, and the syntax for assigning values to variables. This version includes the following changes:

• FORTRAN modules run in VAX native mode
• GETMCR module modified so that CALC can be invoked as a VMS foreign command
• Commands in lower case are converted to upper case
• If a command error occurs, default base is left unchanged
• All known bugs as of May 18, 1981, have been fixed

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Last Update: Thu Jan 11 18:17:09 1996