연산자
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연산자. unary increment prefix: ++x; int x = 5; int y = ++x; System.out.print ( x + “, “ + y);. unary increment postfix: x++; int x = 5; int y = x++; System.out.print ( x + “, “ + y);. Output. Output. File Edit Window Help. File Edit Window Help. 6, 6. 6, 5. modulus - %.

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연산자

unary increment prefix: ++x;

int x = 5;

int y = ++x;

System.out.print( x + “, “ + y);

unary increment postfix: x++;

int x = 5;

int y = x++;

System.out.print( x + “, “ + y);

Output

Output

File Edit WindowHelp

File Edit WindowHelp

6, 6

6, 5


Modulus
modulus - %

int x = 5 % 3;

System.out.print(x);

Output

File Edit WindowHelp

2


Modulus1
modulus - %

짝수? 홀수?

if(x % 2 == 0)… 짝수

else…홀수


Compound operators
Compound Operators

  • x += 5;

  • x -= 5;

  • x *= 5;

  • x /= 5;

  • x %= 5;

int x = 10;

  • x = x + 5;

  • x = x – 5;

  • x = x * 5;

  • x = x / 5;

  • x = x % 5;

  • 15

  • 5

  • 50

  • 2

  • 0


Implicit narrowing conversion
Implicit Narrowing Conversion

byte b = 2;

b = b + 10;

byte b = 2;

b +=10;


Conversion
무슨 conversion?

  • short > int

  • byte > long

  • float > long

  • char > int

  • char > short

  • byte > char


Conversion1
무슨 conversion?

  • short > int

  • byte > long

  • float > long

  • char > int

  • char > short

  • byte > char

  • widening

  • widening

  • narrowing

  • widening

  • narrowing

  • narrowing


Conversions
conversions

byte

short

int

long

char


Conversions between byte short and char are always narrowing conversions requiring explicit cast
conversions between byte, short and char are ALWAYS narrowing conversions requiring explicit cast

byte

short

int

long

char


Conversions between byte short and char are always narrowing conversions requiring explicit cast1
conversions between byte, short and char are ALWAYS narrowing conversions requiring explicit cast

byte

short

char

Narrowing Conversion


Conversions between byte short and char are always narrowing conversions requiring explicit cast2
conversions between byte, short and char are ALWAYS narrowing conversions requiring explicit cast

byte

char

short

Narrowing Conversion


conversions between byte, short and char are ALWAYS narrowing conversions requiring explicit cast

byte b = 16;

char c =

No!

b;


conversions between byte, short and char are ALWAYS narrowing conversions requiring explicit cast

byte b = 16;

char c =

b;

(char)


65535

127

byte

-128

char

0