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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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2659962

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


2659962

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

byte b = 16;

char c =

No!

b;


2659962

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

byte b = 16;

char c =

b;

(char)


2659962

65535

127

byte

-128

char

0


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