ITEC 320 Procedural Programming Dr. Ray Lecture 1

Introduction Outline Welcome Intro to the course Ada – first steps

Introduction Syllabus R Lectures / Interactive demonstrations Office Hours 2:00-3:00 PM MTWF –Saturday 7:00-8:00PM or Sun. 3:00-4:00 Website – => ITEC 320 D2L for submission Projects Homework Exams

Introduction On a scale of 1 to 10, how interested are you in learning a different language? How many lines of code did you write for the largest program you’ve worked on? What do you want to learn in this course? Share with your neighbor Introduce yourselves and answers to the class

Introduction Language s What advantages are there to learning a new computer language? What are the some of the reasons for learning a new language? Why is this important? –Objective C example

Introduction 1970s The era of… Multiple languages used at the DOD… What are some of the problems with using multiple languages? What happens when you use multiple languages for one project?

Introduction Solution Design competition

Introduction Result Procedural / OO mixed language Multi-threaded / generics Reliability and maintenance Readability over writability $line =~ /.{28}(\d\d)-(\d\d)-(\d\d).{8}(.+)$/

Introduction Difference s Java Ada public class HelloWorld { public static void main(String[] args) { int x; x=3; System.out.println(x); } with ada.text_io; with ada.integer_text_io; procedure hello1 is x: Integer; begin x := 3; ada.text_io.put_line("Hello World"); ada.integer_text_io.put(x); end hello1;

Introduction First impressions What are your thoughts on what you just saw? with ada.text_io; with ada.integer_text_io; procedure hello1 is x: Integer; begin x := 3; ada.text_io.put_line("Hello World"); ada.integer_text_io.put(x); end hello1;

Introduction How to make it work Write / Compile / Execute cycle Editors –vi filename.adb Compiler –gnatmake filename Execution –filename or./filename (Mac)

Introduction Types Why is it important to know what type of variable it is that you are using? What are the different types of variables you are familiar with?

Introduction Informatio n Largest and smallest numbers possible Integer add –‘first; –‘last; –‘range; Character –‘val(65); –‘pos(‘A’); Boolean –Boolean’val(0); –Boolean’pos(true);

Introduction Extra types Natural –0 to Integer’Last --Biggest integer Positive –1 to Integer’Last Chance –0.0 to Constrained float

Introduction More types Character (8 bit) Wide_Character (16 bit) Wide_Wide_Character (32 bit) Strings –Arrays of characters –Fixed length –3 types (more later)

Introduction Conversio n Anything to String String to Integer Character conversions intVar’img intVar’image Integer’val(“12”); Integer’value(“123”); Character’val(65); Character’pos(‘A’);

Introduction Output Convert non-strings to strings –Combine strings with the & Output and stay on same line –put( ); Output and goto next line –put_line( ); Enter key –new_line;

Introduction Formatting Output width –minimum width fore –Minimum number of places before decimal aft –Number of places after decimal exp –Minimum number of places for the exponent put(var, width=>2);

Introduction Type checking Both sides of assignments must match Operands of arithmetic operators must match Must do it all manually –In Java, int’s will be converted to floats Extends to output –System.out.println how we will miss thee –ada.integer_text_io.put(3); –ada.text_io.put(“Lots of typing”);

Introduction Summary Short day History of ADA Basics of the language Introductory comparison of the languages