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1.00/1.001 Introduction to Computers and Engineering Problem Solving
Recitation 1 Java and Eclipse
Data Types, Variables, Logical Operators
February 13, 2012
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Outline • Administrative
• Java and Eclipse
• Data Types
• Variables
• Logical Operators
• Homework 1
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Reminders Office Hours
• Wednesday 5pm - 10pm
• Thursday 5pm - 10pm
2 Friday Quizzes: March 9 & April 13
Review session before all quizzes and finals.
• Wed. March 7 7pm - 9pm
• Wed. April 11 7pm – 9pm
• Wed. May 16 7pm – 9pm
Academic Honesty Form – Read it! Sign it!
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Grading
Homework (10) 40%
Active Learning Exercises 10%
Quiz 1 (March 9) 12%
Quiz 2 (April 13) 12%
Final Exam (TBA) 20%
Recitation Participation 6%
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Schedule February March April May
Introduction to Java:
Operators, Control,
Data Types, Methods,
Classes & Objects, Arrays & ArrayLists
Streams, Sensors &
Threads
Inheritance, Interfaces
Data Structures
Graphical User Interfaces
Numerical Methods
Quiz 2
Quiz 1
Final
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Homework • Hard copy available in lecture a week before due date (2 weeks if quiz)
• Electronic copy available a week before the hard copy
• Due on Friday at 12 noon.
• Submissions accepted until 12 noon on Monday, with a 30-point penalty
• 1 no-penalty late submission (still before Monday 12 noon) – You still must turn in your pset!
• A submission is considered late if it has a late tag on the website
• Make sure you submit your .java files, and not your .class files
• Group multiple files in a .zip folder
• Every .java file must start with your name, MIT email and section number
• We do not omit your lowest problem set.
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// Tim B. Ver
// Student’s e-mail address
// 1.00 Problem Set 1 – Terminal Velocity
// 9-15-2011
// TA:
// Section No. R11
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Active Learning Exercises
• Java files to be downloaded before almost every lecture
• Exercises are included in the lecture notes and often use the downloaded files
• Submit your solutions in the Homework section of the website before 8pm. No late submissions allowed.
• Java solutions are released in the Homework section
• PDF solutions and lecture notes including the solutions are released in the In-Class Exercises section
• You can download the lecture notes and the Java files and submit your exercises a week before lecture
• Complete the exercises for 30 lectures to get full credit (10% of final grade)
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What you Installed
Hardware
Intel 32 bit
Intel 64 bit
AMD 64 bit
Java
JRE / JDK
Intel 32 bit JVM
Intel 64 bit JVM
AMD 64 bit JVM
Compiler
One Compiler
Multiple Virtual Machines (JVM)
Eclipse
Text Editor
.java File
.class File
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.java File
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.class File
Don't submit your .class files !
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Java Data Types
Type Size (bits) Range
boolean 1 true or false
char 16 ISO Unicode character set
byte 8 -128 to 127
short 16 -32,768 to 32,767
int 32 -2,147,483,648 to 2,147,483,647
long 64 -9,223,372,036,854,775,808L to 9,223,372,036,854,775,807L
float 32 +/- 3.4E+38F (6-7 significant digits)
double 64 +/- 1.8E+308 (15 significant digits)
8 primitive data types
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Java Data Types
studentCount = 142;
firstLetter = 'a';
weight = 180.6F;
area = Math.PI * 5.0 * 5.0;
enjoy100 = true;
theNumberOne = 1L;
largeNumber = 1.0E100;
int
char
float
double
boolean
long
double
Which data type would you use for:
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Java Data Types
boolean char byte short
int long float double
In practice, we will mostly use:
boolean to represent logic
int, long and double to represent numbers
For text, we will use Strings, which are chains of char.
e.g. String text = "Welcome to 1.00";
A String is an object, not a primitive data type.
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Variables
Data is held in variables
int studentCount = 142;
variable type variable name variable value
• The value on the right is assigned into the left variable name.
• The type of each variable must be declared: Java is a strongly-typed language.
• Variable names typically start with a lowercase letter.
• The variable value must "fit" in the variable type.
assignment operator
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Variables
boolean b = 1;
double studentCount = 142;
byte preRegCount = 110;
int 2 = facultyCount;
Are these variable declarations acceptable? If yes, are they ideal?
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Branching: if ... else
if (x < 0)
System.out.println("x is Negative");
else if (x == 0)
System.out.println("x is Zero");
else
System.out.println("x is Positive");
if (x == 0)
System.out.println("x is Zero");
else
System.out.println("x is NonZero");
• if ... else
• if ... else if ... else
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Branching: if ... else
// e.g. Take the absolute value and notify the user
if (x < 0){
x = -x;
System.out.println("x has been converted");
}
// e.g. Take the absolute value of x
if (x < 0)
x = -x;
• The else statement is not required to terminate branching.
• Use braces {} to execute multiple statements.
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Iteration (Loops)
while (condition to continue)
{
// repeat as long as condition = true
}
do
{
// run once and repeat as long as condition = true
}
while (condition to continue)
for (initial statement; condition to continue; increment statem
{
// execute initial statement
// repeat as long as condition = true
// execute increment statement after each repetition
}
ent)
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Homework 1 Magnetic Inductance
Due: February 17, 2012
Compute magnetic inductance for 3 different types of antennae: 1.Line antenna 2.Coil antenna 3.Rectangular antenna
Also, if (hint) the user selects a coil antenna, and or a rectangular antenna, you will calculate the mutual inductance.
Considerations: •Ask the user which antenna type •Parse user inputs using input dialog •Execute the user’s desired calculations •Print inductance value(s) •Depending on antenna type, you will also be calculating mutual inductance
Total flux
l1
A1A2
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Image by MIT OpenCourseWare. Adapted from Figure 4.8 Finkenzeller,Klaus (2003). RFID Handbook (2nd Edition). Wiley.
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1.00 / 1.001 / 1.002 Introduction to Computers and Engineering Problem SolvingSpring 2012
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