Lecture_2

Topics Discussed

Read pages x, xi, xii of Preface

URLs important

Watched video of train in the Real-Time Embedded Systems Laboratory which is programmed in Ada by students to run

Interesting points

10,000-15,000 lines of code to complete project

first 6 years of course students programmed in C and NO group completed the project

since switching to Ada, 80% of the groups complete the project

Handed out Gold Sheet describing Ada Syntax

Showed what GNAT Ada will look like on system

Showed how to compile, link and run Ada programs under JGrasp

Sample programs discussed in class are available as HTML documents

Example1.adb

TestPut2.adb

Also discussed type declarations on page 15 of text

Discussed

instantiation

type compatibility

semi-colon as a statement terminator

main program unit is a procedure

every program needs at least one executable statement between the begin and the end

to produce output need appropriate WITH clauses

Ada is NOT case sensitive – but we will use standard style conventions although we didn’t do so today

Ada has reserved words

ability to input and output enumerated type values directly

use of named parameters

:= is the assignment operator

-- on a line indicates the start of a comment and no code can follow the comment

=> is called an “arrow” and we saw its use in named parameter passing

‘ is called a tick – all discrete types have attributes such as ‘first and ‘last

if you want to output different types of values on a single line, you will need a separate put statement for each value

Ada has three different parameter passing modes

and ...