I recall that way back in the early to mid-1980s I had the pleasure of perusing a copy of the source code for a Pascal compiler. It was probably created directly under the inventor Nicklaus Wirth in Switzerland. I partially implemented a Pascal emulator for a Data General Eclipse minicomputer.
Here are some of the phases required for the creation of a Pascal computer program:
- Parse the source code.
- Create a symbol table.
- Interpret the symbols.
- Create P-Code for the interpreter.
Running the interpreter code involves translation of the P-Code to a computer readable bit string. Every computer scientist should at some time in her/his formal education should implement an assembler and a compiler.
Yesterday, April 11, 2023, I created a word index C++ application that takes a text file, parses the words, and creates an index also known as an English language symbol table. The app utilizes a C++ map that consists of integer keys and a node containing information about the words and their order in the text file. Below are the indexable text file and the symbol table (index).
This is a test of my index generator. The text file has
two lines. The second line is dummy definitions.
This is a test of my index generator. The text file has
two lines. The second line is dummy definitions.
The first number is the line number and the second the position within a line.
The 1 39
The 2 12
This 1 1
a 1 9
definitions 2 37
dummy 2 31
file 1 48
generator 1 28
has 1 53
index 1 22
is 2 28
is 1 6
line 2 23
lines 2 5
my 1 19
of 1 16
second 2 16
test 1 11
text 1 43
two 2 1
Author: jamespatewilliamsjr
My whole legal name is James Pate Williams, Jr. I was born in LaGrange, Georgia approximately 70 years ago. I barely graduated from LaGrange High School with low marks in June 1971. Later in June 1979, I graduated from LaGrange College with a Bachelor of Arts in Chemistry with a little over a 3 out 4 Grade Point Average (GPA). In the Spring Quarter of 1978, I taught myself how to program a Texas Instruments desktop programmable calculator and in the Summer Quarter of 1978 I taught myself Dayton BASIC (Beginner's All-purpose Symbolic Instruction Code) on LaGrange College's Data General Eclipse minicomputer. I took courses in BASIC in the Fall Quarter of 1978 and FORTRAN IV (Formula Translator IV) in the Winter Quarter of 1979. Professor Kenneth Cooper, a genius poly-scientist taught me a course in the Intel 8085 microprocessor architecture and assembly and machine language. We would hand assemble our programs and insert the resulting machine code into our crude wooden box computer which was designed and built by Professor Cooper. From 1990 to 1994 I earned a Bachelor of Science in Computer Science from LaGrange College. I had a 4 out of 4 GPA in the period 1990 to 1994. I took courses in C, COBOL, and Pascal during my BS work. After graduating from LaGrange College a second time in May 1994, I taught myself C++. In December 1995, I started using the Internet and taught myself client-server programming. I created a website in 1997 which had C and C# implementations of algorithms from the "Handbook of Applied Cryptography" by Alfred J. Menezes, et. al., and some other cryptography and number theory textbooks and treatises.
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Numerical Explorations 