Differences

This shows you the differences between two versions of the page.

--- tutorials:fortran [2014/01/11 02:30]
papa [Input/Output Devices]
+++ tutorials:fortran [2022/03/19 09:52]
papa [CPU/Elapsed time report on program termination]
@@ Line 9: / Line 9: @@
 ===== Peculiarities =====
+==== CPU/Elapsed time report on program termination ====
+The FORTRAN compiler adds a report on CPU and elapsed time used by the program that prints at the end of every program run, like:
+  CPU time 0.08 Elapsed time 0.09
+This message can be suppressed by adding the following line to your program source:
+        CALL QUIETX
+==== DATE subroutine bug ====
+Although the TOPS-20 operating system as a whole survived the Y2K crisis, the FORTRAN DATE subroutine did not fare as well.
+DATE is supposed to return a ten-character string representing the current system date with the format:
+''dd-mmm-yyb''
+Where:
+| ''dd'' | Day of month (leading zero converted to blank) |
+| ''mmm'' | Three-character abbreviation of month ("Jan", "Feb", ...) |
+| ''yy'' | Last two digits of year |
+| ''b'' | blank character |
+However, since the year 2000, the DATE has set the ''yyb'' portion of the returned date to the //first three// digits of the current year, giving the same value for all years of a given decade. For example, for every year between 2010 and 2019, DATE returned "201" in the ''yyb'' portion of the date string.
+This renders the year portion of DATE's output useless for most purposes. A work-around is to program a date subroutine in another language that correctly processes the TOPS-20 system date (such as MACRO assembly language) and call that subroutine from your FORTRAN program instead of the FORTRAN DATE subroutine.
 ==== Input/Output Devices ====

TOPS-20 User Wiki

User Tools

Site Tools

Differences

Page Tools