Programi,Podaci,Varijable,Računanje - 1

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Presentation transcript:

Programi,Podaci,Varijable,Računanje - 1 Java Programi,Podaci,Varijable,Računanje - 1

Varijable Objekt čuva svoje stanje u varijabli. Varijabla je komad informacije imenovan identifikatorom. Deklaracija varijable: syntax: <type> <name> int myNumber ; tip naziv Java © - Eugen Mudnić

Data types Svaka varijabla ima točno određen tip podatka Tip određuje: vrijednosti koje varijabla može sadržavati operacije koje se mogu izvršavati nad tipom podatka Dvije kategorije tipova podataka u Javi: Primitivni tip podataka Reference (za referenciranje objekata) Java © - Eugen Mudnić

Primitivni tipovi podataka Primitive Integer int short byte long float double Numeric Real Character Logical char boolean Java programski jezik (a ne platforma) određuju format tipa podataka (nema zbrke s integer tipom podataka). Java © - Eugen Mudnić

Primitivni tipovi podataka Ključna riječ Opis Veličina/Format (integers) byte Byte-length integer 8-bit two's complement short Short integer 16-bit two's complement int Integer 32-bit two's complement long Long integer 64-bit two's complement (real numbers) float Single-precision floating point 32-bit IEEE 754 double Double-precision floating point 64-bit IEEE 754 (other types) char A single character 16-bit Unicode character boolean A boolean value (true or false) true or false Java © - Eugen Mudnić

Cjelobrojni (Integer) tipovi podataka Integer Type Type Size Min. Value Max. Value byte 8bit -128 127 short 16bit -32768 32767 int 32bit -2147483648 2147483647 long 64bit -9223372036854775808 9223372036854775807 Unsigned are not supported ! byte smallerValue; short pageCount; int wordCount; long bigValue; Java © - Eugen Mudnić

Cjelobrojni (Integer) tipovi podataka red color : sign bit byte max 01111111 byte min 10000000 short max 0111111111111111 short min 1000000000000000 int max 01111111111111111111111111111111 int min 10000000000000000000000000000000 long max 01111111....... long min 10000000....... Java © - Eugen Mudnić

Cjelobrojni (Integer) literali svaki integer literal je pretpostavljeno tipa int (by default) 1,-9999, 123456789 – literali tipa int 1L, -9999L, 123456789L – literali tipa long ne mogu se specificirati byte i short literali baza 16 - 0xFA15 ili 0XFA15 baza 8 – 035, 017 (pažljivo s vodećom nulom !) Java © - Eugen Mudnić

Deklariranje cjelobrojnih varijabli long bigOne; // declaration long bigOne=1024147L; // declaration and initialization long bigOne=9999999L, largeOne=254111L; int xCord=0, yCord=0; // Point coordinates int miles =0, yards =0, feet =0; byte luckyNumber = 7; byte smallNumber = 1234; Before use variable must be declared and value must be assigned ! Java © - Eugen Mudnić

Floating Point (pokretni zarez) tipovi podataka Dva osnovna tipa : float –3.4E38 to +3.4E38 , približno 7 točnih znamenki double -1.7E308 to +1.7E308 , približno. 17 točnih znamenki (najmanja nenulta vrijednost je ±4.9E-324) Pridržavanje IEEE 754 standarda za operacije u pokretnom zarezu Java © - Eugen Mudnić

Floating point literal pretpostavljeno da je floating point literal tipa double 1.0,345.768, 34E22 – literali tipa double 1.0f,345.768F, 34E22f – literali tipa float Java © - Eugen Mudnić

Deklaracija Floating Point varijabli double sunDistance= 1.496E8; float electronMass=9E-28F; float hisWeight=92.2F, herWeight=52.3F; float hisWeight=92.2; prevodilac neće izvršti automatsku konverziju u tip float ! Java © - Eugen Mudnić