1. Computers & Programming Languages

4. 10+2 12
10+2 = 102
10+2 = 12
10+2 = 12 Twelve

5. Lesson4- Objectives
Identify data types
Identify identifiers
Use identifiers to name memory cells
Select the appropriate data type

6. Containers that store data (numbers & letters) in the program.
Variables
Containers that store data (numbers & letters) in the program.
Modern Cars
Modern Calculators

7. Data Type Variable Name ;
Declaration of Variables
Data Type
Data Type Variable Name ;

8. Data Type أنواع البيانات
Activity
Answer the following questions
What’s your name ?
Your Age ?
Your weight ? / selected question
What is the value of PI ?
Are you interested to travel abroad to complete your study ?

9. Data Type أنواع البيانات
Primitive Data Types
integer
byte
short
int
long
Floating Point
float
double
character
char
Boolean
boolean

10. Data Type / Integer
Data type int is the commonly integer type used in programming

11. Data Type / Floating Point
Data type double is the commonly floating point used in programming
Book Activity Page 170

12. Practical Activity Variable name
Open a new java project name (lesson4-1)
Variable name

13. Identifiers consists of A-Z, _ , $ , numbers
Variable identifiers (Name)
Identifiers consists of A-Z, _ , $ , numbers
Identifiers should not start with numbers
Identifiers are case sensitives
Some words should not be used as identifiers : Boolean, byte, class, double, float, public , void ….etc
Illegal identifiers ( 123abc,
Book Activity Page 171

14. Activity in your book P-172

15. Activity in your book P-172
Find Errors & correct them:
Declaration
Error
Correction
int num1
Missing ;
int num1;
duoble price;
double (spelling mistake)
double price;
Int area;
Int (spelling mistake)
int area;
int double;
Reserved word double
int d;
int 3age;
3age
int age3;

16. Activity / group work
An employee earns a basic salary of 5500 AED, transportation 1200 AED, housing allowance 200 AED. Write an algorithm and then create a java program to calculate his total salary.
program
int num1,num2,num3,total;
num1 = 5500;
num2 = 2000;
num3 = 1200;
total = num1 + num2 + num3;
System.out.println ( "total =" + total);
Algorithm
Get basic salary, transportation, housing allowance.
Find total salary = basic salary + transportation + housing allowance.
Print total salary

17. Activity in your book P-172
Create java program that declares two variables which represent your grade and average
program
int grade;
double average;
grade = 10;
average = 90.5;
System.out.println ( “grade is " + grade);
System.out.println ( “average is " + average); 5
Minutes

18. Activity in your book P-172
Suppose that ahmed bought a new smartphone from an electronics shop and that he got 12.5% discount on his purchase. Create a java program to declare the variables.
program
int price;
double discount , Total;
price= 2500;
discount = 0.125;
Total = (price - (price*discount));
System.out.println ( “Price after dsicount" + Total); 5
Minutes