.Open CS320/03 Evolution of Major Languages.
.Table
.Row Previous 02 Preliminaries   Study  handouts +  Chapter 1    lab02 HTML home page
.Row 03 Evolution of Main Languages     Chapter  2        lab03 HTML lab pages
.Row Next 04 Syntax: grammars,  EBNF, parsing        Chapter 3  sections 1 to 3 + Chapter 4  sections 1 to 3 + XBNF
.Close.Table
.Open Assigned work due
              Check the schedule and syllabus on the WWW site. 
              Read $Warnings below.
              Study chapter 2
              Try answering the Review Questions at the end chapter 2.
              Bring written questions+answers to 2 of these review 
questions to class. You can do more if you want.
Your graded questions and answers can be used in the final.
.Close
.Open Warnings
. C++
In Chapter 2, Figure 2.1 are a little misleading. They give
the impression that C++ was finished in the 1980's and ANSI C was derived 
from C++.  In fact, C++ was developed from C in parallel with ANSI C and collected 
several ideas from ANSI C. The early C++ did not have much effect on ANSI 
C. ANSI C was completed in 1989. C++ continued to develop until 1998. ANSI
C++ was drafted in 1997. ANSI/ISO C++ was finished in 1998. See the diagram
below:

.Image 03.gif History of C++

. COBOL
I've never known a real COBOL programmer who wrote "PICTURE IS". We all 
wrote the shorter "PIC". We always omitted stuff like "IS".
Nobody wrote "LABEL RECORDS
ARE STANDARD" and "RECORD SIZE IS <blah>". The compiler worked these out 
for us.

. Ada
My memory of the Ada design process was that both PL/1 and Pascal where 
used as the basis of the early designs. Certainly PL/I was the basis of one
of the 17 early designs even if it didn't make it into the final four.

. APL
The book omits a later development! APL finally escaped the "IBM Golf
Ball with Greek letters" environment. There is language called J
.See http://c2.com/cgi/wiki?JayLanguage
that is 
the direct descendent of APL that works on ASCII/DOS systems.

.Close
. Enrichment -- what is missing from this image
.See http://www.veracode.com/blog/2013/04/the-history-of-programming-languages-infographic/
. Class Work
.See http://www/dick/cs320/03q.html
. Lab Work Your first real lab Page
.See ./lab/03.html
. Next
.See ./04.html