Data Type & Input/Output Session 3 Course: T0974-Algorithm & Object-Oriented Programming I Year: 2010

Bina Nusantara Learning Outcomes After taking this course, student should be expected to be able to apply data types depend on the need of the programs and using syntax for Input – Output Operation

JAWABAN QUIZ Bina Nusantara University 4 public class Gaji { public static void main(String [] args) { Hitung h= new Hitung(); //membuat obyek dari //kelas Hitung h.basic= ; h.tunjangan= ; h.bolos=2; h.hitung(); } } class Hitung{ int bolos=0; int total=0; int basic=0; int tunjangan=0; String nama="RINA"; void hitung() { if (bolos<=3) { total=basic+tunjangan; } else { total=basic; } System.out.println ("Nama " + nama+ " Jumnlah bolos:" + bolos); System.out.println ("Gaji :" + total); } }

Bina Nusantara Outline Materi •Data Types •Input/Output (I/O) •Output Format •Type Casting (Conversion) •ASCII •Import •Constant

Bina Nusantara Data Type •An attribut that has range value and type. •To be used as a value storage from execution process. •Based on its data type : –Boolean (boolean) –Numeric (byte, short, int, long, float, double) –Character (char) –String (String)

Bina Nusantara Data Type •Based on Complexity : –Atomic DT (boolean, byte, char, short, int, long, float, double) –Composite DT (Array, Struct, List, Queue, Stack, String, Tree) •Based on Source: –Native / primitive / basic DT –Abstract DT •Based on Customization: –Built-in DT –User-defined DT

Bina Nusantara Data Type NameRangeSizeClass booleantrue, false1 bitBoolean byte-2 7 (-128) to 2 7 – 1 (127)8 bitByte char0 to 65,53516 bitCharacter short-2 15 (-32,768) to 2 15 – 1 (32,767) 16 bitShort int-2 31 (-2,147,483,648) to 2 31 (2,147,483,647) 32 bitInteger long-2 63 to 2 63 – 164 bitLong float-3.4E38 to 3.4E3832 bitFloat double-1.798E308 to 1.798E30864 bitDouble

Bina Nusantara Data Type Filename : TipeData.java Output:

Bina Nusantara Input / Output (I/O) •A Communication between computer to other entity (Human / Machine) •Input: Signal/Data will be recevied by system. •Output: Signal/Data will be sent from system. •I/O perform or I/O operation.

Bina Nusantara Input / Output (I/O) •Input Devices e.g. : keyboard, mouse •Output Devices e.g. : monitor, printer •I/O Devices e.g. : disk, file

Bina Nusantara Input / Output (I/O) •Get input from console using Scanner. •Library java.util.Scanner. •It needs to import declaration : import java.util.Scanner; •Afterward declare an object creation : Scanner input = new Scanner(System.in);

Bina Nusantara Input / Output (I/O) MethodUse next();Input String (word) nextLine();Input String (sentence) nextByte();Input number (byte) nextShort();Input number (short) nextInt();Input number (int) nextLong();Input number (long) nextFloat();Input number (float) nextDouble();Input number (double)

Bina Nusantara Input / Output (I/O)

Bina Nusantara Input / Output (I/O)

Bina Nusantara Input / Output (I/O) SpecifierDescriptionExampleOutput %bboolean%6b false true %ccharacter%5c a %dinteger%5d %fFloating-point%5.2f %escientific%10.2e 3.14e+02 %sstring%10s hello •Note :  spasi

Bina Nusantara Input / Output (I/O) SpecifierDescriptionExampleOutput %bboolean%-6b false true %ccharacter%-5c a %dinteger%-5d %fFloating-point%-5.2f %escientific%-10.2e 3.14e+02 %sstring%-10s hello •Note :  spasi

Bina Nusantara Input / Output (I/O)

Bina Nusantara Input / Output (I/O) •System.out.print  print into console without linefeed (newline). •System.out.println  print into console with linefeed (newline) •System.out.printf  same as System.out.print, supports format output

Bina Nusantara Type Casting (Conversion) •Convert a value to different type. •Type casting conversion : –Widening a type: convert a value from smaller data to bigger data. (Automatically done by Java). –Narrowing a type: convert a value from bigger data to smaller data. •Size of data type (smallest to biggest) byte, short, int, long, float, double

Bina Nusantara Type Casting (Conversion) •Parentheses is use as a syntax for narrowing. •Example 1: –float f = (float) 10.1; –int i = (int) f; •Example 2 : –double d = 4.5; –int i = (int) d; •As depicted from example 1-2 above, f and d values haven’t been changed.

Bina Nusantara Type Casting (Conversion)

Bina Nusantara Type Casting (Conversion) •Conversion from String to Atomic data type can be done by class helper. ClassKonversi ke tipe dataPemakaian BooleanbooleanBoolean.parseBoolean(…); BytebyteByte.parseByte(…); CharactercharString.charAt( ); ShortshortShort.parseShort(…); IntegerintInteger.parseInt(…); LonglongLong.parseLong(…); FloatfloatFloat.parseFloat(…); DoubledoubleDouble.parseDouble(…);

Bina Nusantara Type Casting (Conversion)

Bina Nusantara Type Casting (Conversion)

Bina Nusantara Type Casting (Conversion)

Bina Nusantara ASCII •American Standard Code for Information Interchange •7-bit, 128 characters (000 s/d 127) •uppercase/lowercase letters, digits, punctuation marks, dan control characters •Next development of ASCII  Unicode has 1,112,064 characters.

Bina Nusantara ASCII

Bina Nusantara ASCII

Bina Nusantara ASCII

Bina Nusantara Type Casting (Conversion) cont. •ASCII characters from ‘0’ s/d ‘9’ –‘0’  48 –‘1’  49 –‘9’  57 •Convert character to number can be done by substracting 48. •Convert number to character can be done by adding 48.

Bina Nusantara Type Casting (Conversion) cont.

Bina Nusantara Constant •a constant variable is a variable that is always constant •Example : –π (PHI) = –g (gravitation) = 9.8 •Constant should have been declared and initialized. •Final is a keyword in Java to declare constant. •Declaration : –final datatype CONSTANTNAME = VALUE; –Example: final double PHI = ;

Bina Nusantara Constant

Bina Nusantara Did You Know? •For every Scanner use, it should need “import java.util.Scanner;”. •Because Scanner is a class that should be included. •Contrary to System library, it doesn’t use “import java.lang.System;” declaration which Java automatically import all of “java.lang” content to its new code.

Bina Nusantara Did You Know? •Content of java.lang which is usually used : –Boolean –Byte –Character –Double –Float –Integer –Long –Math –Short –String –System –Thread

Bina Nusantara Advanced Learning •Instead of scanner, BufferedReader can be used for handling input from console. •It needs import from java.io.BufferedReader & java.io.InputStreamReader; •And do object creation : –BufferedReader input = new BufferedReader (new InputStreamReader(System.in)); •Either use read() method for reading single character or readLine() method for reading word.

Bina Nusantara Advanced Learning

Bina Nusantara Advanced Learning •Import declaration like : import java.io.BufferedReader; import java.io.InputStreamReader; can be shortened to: import java.io.*; •try and catch are going to be disscussed next lecture (Exception Handling)

Latihan Kembangkan jawaban quiz untuk terima input dari keyboard menggunakan Kelas Scanner Bina Nusantara University 40

Bina Nusantara References •Introduction to Java. 7ed Liang. p60, p67-71, p79- 81, p , p •Java Software Solutions. 5ed Lewis. p99-103, p •The Complete Reference: Java. 5ed Herbert. p33-48 •Dasar Pemrograman Java Abdul Kadir. p66-73 •Composite Data Types. •Data Type. •Primitive Data types. /datatypes.html /datatypes.html •Primitive Data types.