Computers Programming Languages 102 12 102 102 102
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Computers & Programming Languages
10+2 12 10+2 = 102 10+2 = 12 Twelve
Lesson 4 - Objectives § Identify data types § Identify identifiers § Use identifiers to name memory cells § Select the appropriate data type
Variables Containers that store data (numbers & letters) in the program. Modern Cars Modern Calculators
Declaration of Variables Data Type Variable Name ;
Data Type Activity 1. 2. 3. 4. 5. ﺃﻨﻮﺍﻉ ﺍﻟﺒﻴﺎﻧﺎﺕ 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 ?
Data Type ﺃﻨﻮﺍﻉ ﺍﻟﺒﻴﺎﻧﺎﺕ Primitive Data Types Floating Point integer byte short int long float double character Boolean char boolean
Data Type / Integer 6 Data type int is the commonly integer type used in programming
Data Type / Floating Point 6 Data type double is the commonly floating point used in programming Book Activity Page 170
Practical Activity § Open a new java project name (lesson 4 -1) Variable name
Variable identifiers (Name) 1. 2. 3. 4. 5. 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 ( 123 abc, -salary, @palace Book Activity Page 171
Activity in your book P-172
Activity in your book P-172 § Find Errors & correct them: Declaration Error Correction int num 1 Missing ; int num 1; duoble price; double (spelling mistake) double price; Int area; Int (spelling mistake) int area; int double; Reserved word double int d; int 3 age; 3 age int age 3;
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. Algorithm 1. Get basic salary, transportation, housing allowance. 2. Find total salary = basic salary + transportation + housing allowance. 3. Print total salary program int num 1, num 2, num 3, total; num 1 = 5500; num 2 = 2000; num 3 = 1200; total = num 1 + num 2 + num 3; System. out. println ( "total =" + total);
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; 5 Minutes System. out. println ( “grade is " + grade); System. out. println ( “average is " + average);
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)); 5 Minutes System. out. println ( “Price after dsicount" + Total);
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