CS1150 Principles of Computer Science Introduction Yanyan Zhuang - - PowerPoint PPT Presentation

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CS1150 Principles of Computer Science Introduction Yanyan Zhuang - - PowerPoint PPT Presentation

Jan 07, 2023 208 likes •517 views

CS1150 Principles of Computer Science Introduction Yanyan Zhuang Department of Computer Science http://www.cs.uccs.edu/~yzhuang CS1150 UC. Colorado Springs Intro of Intro Yanyan Zhuang o PhD 2012 o yzhuang@uccs.edu o Office ENGR 184

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SLIDE 1
  • UC. Colorado Springs

CS1150

CS1150 Principles of Computer Science

Introduction

Yanyan Zhuang

Department of Computer Science http://www.cs.uccs.edu/~yzhuang

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SLIDE 2

Intro of Intro

  • UC. Colorado Springs

CS1150

  • Yanyan Zhuang
  • PhD 2012
  • yzhuang@uccs.edu
  • Office ENGR 184
  • Office hours
  • M/W: 11:15am – 12:00pm
  • TA’s schedule – Abdullah Abu Mouzah (aabumouz@uccs.edu)

} Tue and Wed: 9:30AM - 11:00AM ENG 232 } Fri: 9:30AM - 11:00 AM ENG 138

  • Math center https://www.uccs.edu/mathcenter/schedules
  • Canvas: announcement, assignment, tests (need to opt in)
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SLIDE 3

Lectures, Assignments, Project, Exams

  • UC. Colorado Springs

CS1150

  • Lectures
  • Monday and Wednesday, ENGR 138
  • Assignments (individual)
  • Java programming assignments
  • Attendance
  • Midterm and Final (in class, online, open-book/notes)
  • Midterm: TBD
  • Final: 12/18
  • Syllabus
  • http://cs.uccs.edu/~yzhuang/CS1150/fall2019/syllabus.pdf
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SLIDE 4

Outline

  • UC. Colorado Springs

CS1150

  • What will you learn?
  • Programming languages
  • Anatomy of a Java program
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SLIDE 5

What will you learn?

  • UC. Colorado Springs

CS1150

  • Programming with emphasis on computer

science concepts

  • Particularly on the concepts of abstraction in problem

solving

} Primitive data types } Selection statements } Loops and methods } Arrays, strings and so on } …

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SLIDE 6
  • UC. Colorado Springs

CS1150

Introduction

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SLIDE 7

Programming

  • UC. Colorado Springs

CS1150

  • Computer programs, known as software, are

instructions to the computer

  • We (programmers) tell a computer what to do

through programs

  • Computers do not understand human languages (Siri, doh!),

need to use computer languages to communicate with them

  • Most programs are written using (high-level) programming

languages

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SLIDE 8

Programming Languages

  • UC. Colorado Springs

CS1150

  • The high-level languages are English-like and

easy to learn and program

  • For example, the following is a high-level language

statement that computes the area of a circle with radius 5:

}

area = 5 * 5 * 3.1415;

  • We will learn Java in this course
  • What are the other programming languages available?
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SLIDE 9

Let’s create our first Java program!

  • UC. Colorado Springs

CS1150

  • Please open Eclipse (in Desktop à Software, first time takes 1 min):
  • To create a project

}

File à New à Project à Choose Java project à Fill in project name (e.g., CS1150) à Finish

}

If you see “Open Associated Perspective”, choose No

  • To import existing code

}

File (with src selected) à Import à Select “Archive File” under “General” à Browse and locate your zip (no need to unzip it) à Finish

  • To create new code

}

File (with project CS1150 selected) à New à Other à Class à Fill in class name à Finish

  • To find the location of your code

}

Project à Properties (look for Location)

¨ Windows: C:\Users\username\eclipse-workspace\project_name ¨ Mac: /Users/username/Documents/eclipse-workspace/project_name

}

Code is under project_name\src\ (Windows) or project_name/src/ (Mac)

  • Eclipse video tutorial: https://www.youtube.com/watch?v=Wv6nxnVKYsw

}

Skip things that you don’t understand

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SLIDE 10

Anatomy of a Java Program

  • UC. Colorado Springs

CS1150

  • 1. Class name
  • 2. Main method
  • 3. Statements
  • 4. Statement terminator
  • 5. Reserved words
  • 6. Comments
  • 7. Blocks
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SLIDE 11

Class Name

  • UC. Colorado Springs

CS1150

  • Every Java program must have at least one
  • class. Each class has a name (same name as

.java file)

  • By convention, class names start with an uppercase letter
  • In this example, the class name is Welcome

// This program prints Welcome to Java! public class Welcome { public static void main(String[] args) { System.out.println("Welcome to Java!"); } }

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Main Method

  • UC. Colorado Springs

CS1150

  • In order to run a class, the class must contain a

method named main

  • The program is executed from the main method

// This program prints Welcome to Java! public class Welcome { public static void main(String[] args) { System.out.println("Welcome to Java!"); } }

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Statement

  • UC. Colorado Springs

CS1150

  • A statement represents an action or a

sequence of actions

  • The statement System.out.println("Welcome to Java!") is a

statement to display the greeting "Welcome to Java!” // This program prints Welcome to Java! public class Welcome { public static void main(String[] args) { System.out.println("Welcome to Java!"); } }

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SLIDE 14

Statement Terminator

  • UC. Colorado Springs

CS1150

  • Every statement in Java ends with a semicolon

(;)

// This program prints Welcome to Java! public class Welcome { public static void main(String[] args) { System.out.println("Welcome to Java!"); } }

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SLIDE 15

Reserved words

  • UC. Colorado Springs

CS1150

  • Reserved words or keywords
  • Words that have a specific meaning to Java and cannot be

used for other purposes in the program

  • For example, when Java sees class, it understands that the

word after class is the name for the class // This program prints Welcome to Java! public class Welcome { public static void main(String[] args) { System.out.println("Welcome to Java!"); } }

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Blocks

  • UC. Colorado Springs

CS1150

  • A pair of curly braces in a program forms a

block that groups a component of a program

public class Test { public static void main(String[] args) { System.out.println("Welcome to Java!"); } }

Class block Method block

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{ … }

  • UC. Colorado Springs

CS1150

  • Denotes a block

// This program prints Welcome to Java! public class Welcome { public static void main(String[] args) { System.out.println("Welcome to Java!"); } }

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( … )

  • UC. Colorado Springs

CS1150

  • Used with methods
  • To group together arguments

// This program prints Welcome to Java! public class Welcome { public static void main(String[] args) { System.out.println("Welcome to Java!"); } }

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SLIDE 19

// …

  • UC. Colorado Springs

CS1150

  • Another kind of comments is /* … */
  • Block comment

// This program prints Welcome to Java! public class Welcome { public static void main(String[] args) { System.out.println("Welcome to Java!"); } }

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" … "

  • UC. Colorado Springs

CS1150

  • Do not use ‘ … ‘ for Strings
  • They are used for characters instead

// This program prints Welcome to Java! public class Welcome { public static void main(String[] args) { System.out.println("Welcome to Java!"); } }

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SLIDE 21

Special Symbols

  • UC. Colorado Springs

CS1150

Character Name

Description {} () [] // " " ; Opening and closing braces Opening and closing parentheses Opening and closing brackets Double slashes Opening and closing quotation marks Semicolon Denotes a block to enclose statements. Used with methods. Denotes an array. Precedes a comment line. Enclosing a string (i.e., sequence of characters). Marks the end of a statement.

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SLIDE 22

Identifiers

  • UC. Colorado Springs

CS1150

  • An identifier is
  • A name chosen by the programmer for: classes, methods,

variables, and constants // This program prints Welcome to Java! public class Welcome { public static void main(String[] args) { System.out.println("Welcome to Java!"); } }

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SLIDE 23

Let’s do more practice!

  • UC. Colorado Springs

CS1150

  • To import our code
  • File à Import à Archive File à Browse (find your

downloaded zip file) à Open

  • MyFirstWords, MyFirstLines
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SLIDE 24

Programming Style and Documentation

  • UC. Colorado Springs

CS1150

  • Appropriate Comments
  • Naming Conventions
  • Proper Indentation and Spacing Lines
  • Write pseudocode
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Appropriate Comments

  • UC. Colorado Springs

CS1150

  • Include a summary at the beginning of the program to

explain what the program does /* */ (block comment)

  • Include your name, class section, date, and a brief description at the

beginning of the program

} /* Programmer: Yanyan Zhuang

* Class: CS 1150 * Purpose: Print a string to the console * Date modified: 6/6/2019, 6/10/2019 */

  • Use // above or after a line of statement to indicate its

purpose, when necessary (single-line comment)

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Naming Conventions

  • UC. Colorado Springs

CS1150

  • Choose meaningful and descriptive names
  • Class names:
  • Capitalize the first letter of each word in the name. For example,

the class name ComputeExpression

  • A name cannot contain spaces
  • ComputeExpression, not Compute Expression
  • Convention

} Class names start with an upper case letter } Variable/method names start with a lower case letter } Constants all caps

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SLIDE 27

Proper Indentation and Spacing

  • UC. Colorado Springs

CS1150

  • Indentation
  • Indent the same code blocks with the same indentation

level

  • Spacing
  • Use blank line to separate segments of the code

(ComputeExpression)

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SLIDE 28

Write pseudocode

  • UC. Colorado Springs

CS1150

  • Not real code
  • Get back to this in a bit!!
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SLIDE 29

Summary

  • UC. Colorado Springs

CS1150

  • Java program
  • Programming style
  • Data types and calculation