SE 2040 Sample Code

Ruby Examples

echoinput.rb: echo standard input to standard output (with line numbers); type
```
        ruby echoinput.rb < echoinput.rb
```
at the command prompt (after installing Ruby) to display the program.
sum.rb: compute sum of entered numbers. Enter
```
        ruby sum.rb
        5
        4
        3
        Control-Z
```
(where the last line is holding down the control key and pressing a Z) to print a 12.

generate.rb: generate a list of numbers, one per line:

        ruby generate.rb 20 30 3 | ruby sum.rb
        98

gpa.rb: compute GPA
- revised-gpa.rb: a version of gpa.rb that can be loaded as a part of a larger project
countvowels.rb: Ruby code to count vowels in the input, illustrating breaking a program into multiple functions with a main.
phones.rb: simple phone book based on arrays; to test, run irb and type
```
        irb> load 'phones.rb'
        irb> test_phone_book
```
revised-phones.rb: revised phone book using hash tables.

C++ Examples

ave.cpp: print the average of a list of integers
ave1000.cpp: same, but using arrays; build with g++ -std=c++11 ave1000.cpp
round_error.cpp: illustrates why == on floats is a bad idea
simple_time.cpp: illustrates simple classes (along with cassert)
occurrences.cpp: count number of times a character appears input. If build to a.exe, then
```
        a.exe < occurrences.cpp
```
counts 17 semicolons, and
```
        a.exe _ < occurrences.cpp
```
counts 5 underscores.
increasing-numbers.cpp: illustrates writing an eof-controlled loop with limits
- increasing-numbers-v2.cpp: Same, but using functions.
distinct1000.cpp: count number of distinct values in the input.
countvowels.cpp: count the number of vowels; illustrating reading input by characters (and including code to read from a file as well as standard input). This is the C++ version of countvowels.rb.
todo.cpp: simple todo list using fixed-size arrays and strings.
Todo lists with pointers: a more extensible version of ToDo lists, this time using pointers so each ToDo item has identity. This version also illustrates documenting classes and methods in a reasonable way.
ave.h, ave.cpp, printave.cpp: illustrating separate compilation and reference parameters
simple_vector.h: Simple vector code
Time example: illustrates simple inheritance
Account balance: computing account balances, illustrating definitions distributed over multiple files.
alg-examp.cpp: illustrate algorithm code
slist.cpp: Simply Linked List
rwh_string.cpp: simple implementation of arbitrary-length strings
list_iterator.cpp: illustrates iterating over a list

C Examples

RPN Calculator
Average Example, C version: a rewrite of ave.cpp
Average of 1000 doubles, C version: a rewrite of ave1000.cpp, but this version prompts for inputs and computes the average of doubles
array.c: illustrates properties of arrays
points0.c, points.c: structs in C using two different styles
messed_up.c: really odd code...
hello.c: yup
- See also: MysteryCode.java