2. Date School of Computing Slide 2
Recap of COMP 150
• Try to remember the commands and practice
them on the next sets of questions
• Topics to cover:
• Simple Program (printing name)
• Conditional/Selection Statement
• Iterative Statements (Loop)
• Functions
• Array
3. Date School of Computing Slide 3
Basic Program
• Print your name and university name
• Print the addition of 3 and 4
• Write a program to find the final value for the
expression 8 + 2 x 3 - 5
4. Date School of Computing Slide 4
Some more Basic Programs . . .
Write a program that takes 2 integer inputs from
user and prints the product of those integers
Write a program that will take the radius of a
circle as floating point input and will print the
area of that circle.
4
5. Date School of Computing Slide 5
Programs with conditional statements
Write a program that will take two integer inputs
and find the larger no among them.
Write a program that will take an integer from
keyboard and will determine whether the
number is even or odd.
5
6. Date School of Computing Slide 6
Programs with loops
• Write a program that will print your name 10 times.
• Write a program that will find the sum of integers between 11 and 20.
• Write a program that will take 10 integer inputs from keyboard and print
the sum, average and maximum number.
• Write a program to find whether a given integer input is prime or not.
6
7. Date School of Computing Slide 7
Functions
Write a program that contains a function named findArea() which takes the radius of a
circle and prints its area.
Write a program that contains the a function checkPrime() which takes an integer as
parameter and prints whether the parameter is prime or not
Write a program that finds the total number of prime numbers within a given range;
you have to use a function to check primes. The program will take the range
boundaries from user.
7
8. Date School of Computing Slide 8
Arrays
Write a program that declares an array of 5 floating point
numbers and takes those floating point numbers from keyboard
input. Then it will print the square of each elements.
Write a program to declare a 3 by 3 matrix. Take input for all the
elements of that matrix and print the matrix. Finally find the sum
of all elements.
8
9. Date School of Computing Slide 9
Recap...
9
● Finish all programs yourself
● Revise the previous lectures and practice the logic of
programming
10. Date School of Computing Slide 10
Short History of Java
• Java was originally developed by Sun Microsystems
starting in 1991
– James Gosling
– Patrick Naughton
– Chris Warth
– Ed Frank
– Mike Sheridan
• This language was initially called Oak
• Renamed Java in 1995 after the coffee from Indonesia
11. Date School of Computing Slide 11
JAVA …
• A simple, object oriented, distributed,
‐
interpreted, robust, secure, architecture neutral,
portable, high performance, multithreaded, and
‐
dynamic language ‐‐ Sun Microsystems
• Object Oriented
‐
– No free functions
– All code belong to some class
– Classes arranged in a hierarchy or package structure
12. Date School of Computing Slide 12
JAVA …
• Distributed
– Fully supports IPv4, with structures to support IPv6
– Includes support for Applets: small programs
embedded in HTML documents
• Interpreted
– The program are compiled into Java Virtual Machine
(JVM) code called bytecode
– Each bytecode instruction is translated into machine
code at the time of execution
13. Date School of Computing Slide 13
JAVA . . .
• Robust
– Java is simple : no pointers/stack concerns
– Exception handling
• try/catch/finally series allows for simplified error recovery
– Strongly typed language
• many errors caught during compilation
• Architecture Neutral
– Runs in both Windows and Linux based machines
– Runs in all configurations
14. Date School of Computing Slide 14
Java: Platform Neutral
15. Date School of Computing Slide 15
Installing Java
• First, download and install Java Development
Kit (JDK)
• Second, download and install Eclipse for Java
IDE
16. Date School of Computing Slide 16
Creating the Environment
• Create a Project
– New -> Project -> Java Project
– Give a name say JavaWorks
• Create a Package
– Right click on the Project and select
New -> Package
- Give a name for example Week01 (No spaces in package name)
- Create a class
- Right click on the package and select new -> class
- Give a name, say Example
28. Date School of Computing Slide 28
Scope & Lifetime of a Variable
29. Date School of Computing Slide 29
Scope & Lifetime of a variable
30. Date School of Computing Slide 30
Practicing
• Try the programs mentioned in the slides
previously now in Java
• Complete the “Week_01_Lab1” file tasks
