lesson 3 - java names and labels

Java Names and Labels

ASCIIAmerican Standard Code for Information Interchange

ASCII is now the universal standard for computers to decode all letters of the alphabet and special characters.

Powerpoint TemplatesPage #ASCII

Symbol64656667686970717273747576777879@ABCDEFGHIJKLMNOPowerpoint TemplatesPage #Castingprocess of converting a value to the type of a variable

Powerpoint TemplatesPage #Concatenation

process of joining values togetherPowerpoint TemplatesPage #Constant

identifier whose value can never be changed once initializedPowerpoint TemplatesPage #Identifier

user-defined name for methods, classes, objects, variables, and labelsPowerpoint TemplatesPage #Java Keyword

word used by the Java compiler for a specific purposePowerpoint TemplatesPage #Literals

values assigned to variables or constantsPowerpoint TemplatesPage #Unicode

Universal code that has a unique number to represent each characterPowerpoint TemplatesPage #Variable

identifier whose value can be changedPowerpoint TemplatesPage #Identifiers are user-defined names for methods, variable, constants, and classes. Rules:The first character of your identifier should start with a letter of the alphabet, an underscore ( _ ), or a dollar sign ($). After that, the identifier can then be composed of alphanumeric characters and underscores.Powerpoint TemplatesPage #2. Create identifiers that are descriptive of their purpose. If your identifier is composed of several words, capitalizing the first letter of each word is a good programming practice.Powerpoint TemplatesPage #Valid IdentifiersInvalid IdentifiersMyIdentifierNameMy Identifier Namemyidentifiernamemy+identifier+namemy_identifier_namemy-identifier-name_myidentifiernamemy_identifiers_name$myidentifiernamemy_identifier_&_name_3names3namesPowerpoint TemplatesPage #Data types Primitive data typesReference data types Powerpoint TemplatesPage #Primitive data typesData typeExample/s stringhello worldbooleantrue, falsechar A, z, \n, 6byte1short11int 167long 11167Lfloat 63.5Fdouble 63.5Powerpoint TemplatesPage #Data TypeLengthRangebyte 8 bits-2 7 to 2 7 -1short 16 bits-2 15 to 2 15 -1int 32 bits-2 31 to 2 31 -1long 64 bits-2 63 to 2 63 -1Powerpoint TemplatesPage #Variables are identifiers whose values can be changed. general syntax is :

;

int numberPowerpoint TemplatesPage #Examples booleanPassed;charEquivalentGrade;byteYearLevel;shortClasses;int Faculty_No;long Student_No;float Average;DoubleLogarithm;StringLastName; Powerpoint TemplatesPage #Examples booleanPassed =true;charEquivalentGrade =F;byteYearLevel =2;shortClasses =19;int Faculty_No =6781;long Student_No =76667L;float Average =76.87F;doubleLogarithm=0.879463434;StringLastName =Bonifacio; Powerpoint TemplatesPage #Examples booleanPassed =true, Switch;charEquivalentGrade =F, ch1,ch2;byteYearLevel =2;shortClasses =19;int Faculty_No =6781, Num1;long Student_No =76667L, Employee_No, Long;float Average =76.87F, Salary;doubleLogarithm =0.879463434, Tax, SSS;StringLastName =Bonifacio, FirstName=Andres; Powerpoint TemplatesPage #Casting Powerpoint TemplatesPage #public class Core{public static void main (String [] args){ int x=10, Average=0; double Quiz_1=10, Quiz_2=9; char c=a;Average=(int) (Quiz_1=Quiz_2)/2);//explicit casting x=c; //implicit casting from char to intSystem.out.println(The ASCII equivalent);System.out.println(of the character a is : +x);System.out.println(This is the average of the two quizzes: +Average);}}

Powerpoint TemplatesPage #22

Powerpoint TemplatesPage #

public class Core{


public static void main (String [] args){


int x=10, Average=0;double Quiz_1=10, Quiz_2=9;char c=a;Powerpoint TemplatesPage #26

Average=(int) (Quiz_1+Quiz_2)/2);//explicit casting

Powerpoint TemplatesPage #27x=c; //implicit casting from char to int


System.out.println(The ASCII equivalent);System.out.println(of the character a is : +x);System.out.println(This is the average of the two quizzes: +Average);}}

Powerpoint TemplatesPage #29public class Core{public static void main (String [] args){ int x=10, Average=0; double Quiz_1=10, Quiz_2=9; char c=a; Average=(int) (Quiz_1+Quiz_2)/2); //explicit casting x=c; //implicit casting from char to int System.out.println(The ASCII equivalent); System.out.println(of the character a is : +x); System.out.println(This is the average of the two quizzes: +Average);}}


Powerpoint TemplatesPage #Get sheet of paperPowerpoint TemplatesPage #Write V if the identifier is valid.Write I if it is invalid.Powerpoint TemplatesPage #variable 2 mainAverage+quizzes principal_amount$ratesum_quiz1&quiz2 int 3xPowerpoint TemplatesPage # x-5 PRODUCT firstname AreaofSquare periMeter num_1 a*bPowerpoint TemplatesPage #IIIVVIII

9. I10. V11. V12. V13. V14. V15. IPowerpoint TemplatesPage #Powerpoint TemplatesPage #Powerpoint TemplatesPage #Identify the data type for variables and literals given.Powerpoint TemplatesPage # x = a quiz1 = 90.75 age = 15 age2=15 years old num3 = 10.91FIdentify the data type for variables and literals given.Powerpoint TemplatesPage #6. failed = false7. interest = 10008. size = small9. cents = 0.8753910. date = 11-30-1998 Identify the data type for variables and literals given.Powerpoint TemplatesPage # x = a quiz1 = 90.75 age = 15 age2=15 years old num3 = 10.91FIdentify the data type for variables and literals given.Powerpoint TemplatesPage #6. failed = false7. interest = 10008. size = small9. cents = 0.8753910. date = 11-30-1998 Identify the data type for variables and literals given.Powerpoint TemplatesPage #Create a program that will compute the sum of 20 and 11.5 and display the result.Powerpoint TemplatesPage #let

num1 = 20num2 = 11.5sum = num1+num2Variables (Identifiers)Powerpoint TemplatesPage #

int num1 = 20double num2 = 11.5double sumPowerpoint TemplatesPage #public class Sum

Powerpoint TemplatesPage #public class Sum{

Powerpoint TemplatesPage #public class Sum{public static void main (String[]args)

Powerpoint TemplatesPage #public class Sum{public static void main (String[]args) {

Powerpoint TemplatesPage #public class Sum{public static void main (String[]args) {int num1=20;double num2=11.5;double sum;


sum=num1+num2;


sum=num1+num2;System.out.println(The sum is: +sum);

Powerpoint TemplatesPage #public class Sum{public static void main (String[]args) {int num1=20;double num2=11.5;double sum;sum=num1+num2;System.out.println(The sum is: +sum); }

Powerpoint TemplatesPage #public class Sum{public static void main (String[]args) {int num1=20;double num2=11.5;double sum;sum=num1+num2;System.out.println(The sum is: +sum); }}


sum=num1+num2;System.out.println(The sum is: +sum); }}

DeclarationsFormula Powerpoint TemplatesPage #

The sum is: 31.5Powerpoint TemplatesPage #

1. Create a program that will get the difference of 150 and 75. Then display the result.

Use Difference as the class namePowerpoint TemplatesPage #

2. Create a program that will get the average of 35, 42 and 23. Then display the result.

Use Average as the class name.Powerpoint TemplatesPage #

3. Create a program that will get the product of 18 and 15. Then display the result.

Use Product as the class name.Powerpoint TemplatesPage #

4. Create a program that will get the quotient of 185 and 13. Then display the result.

Use Quotient as the class name.Powerpoint TemplatesPage #public class Difference{public static void main (String[]args) {int num1=150;int num2=75;int difference;

difference=num1-num2;System.out.println(The difference is: +difference); }}

Powerpoint TemplatesPage #The difference is 75.Powerpoint TemplatesPage #public class Average{public static void main (String[]args) {int num1=35;int num2=42;int num3=23;double ave;

ave=(num1+num2+num3)/3;System.out.println(The average is: +ave); }}

Powerpoint TemplatesPage #The average is 33.33Powerpoint TemplatesPage #public class Product{public static void main (String[]args) {int num1=18;int num2=15;int product;product=num1*num2;System.out.println(The average is: +product); }}

Powerpoint TemplatesPage #The product is 270.Powerpoint TemplatesPage #public class Quotient{public static void main (String[]args) {int num1=185;int num2=13;int quotient;quotient=num1/num2;System.out.println(The quotient is: +quotient); }}

Powerpoint TemplatesPage #The quotient is 14.23Powerpoint TemplatesPage #public class Sample{ public static void main (String [] args) { System.out.println(Melanie Cruz);}}

Powerpoint TemplatesPage #

lesson 3 - java names and labels

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