연산자

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# 연산자 - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about '연산자' - daxia

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Presentation Transcript
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 - %

int x = 5 % 3;

System.out.print(x);

Output

File Edit WindowHelp

2

modulus - %

짝수? 홀수?

if(x % 2 == 0)… 짝수

else…홀수

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

byte b = 2;

b = b + 10;

byte b = 2;

b +=10;

무슨 conversion?
• short > int
• byte > long
• float > long
• char > int
• char > short
• byte > char
무슨 conversion?
• short > int
• byte > long
• float > long
• char > int
• char > short
• byte > char
• widening
• widening
• narrowing
• widening
• narrowing
• narrowing
conversions

byte

short

int

long

char

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 cast

byte

short

char

Narrowing Conversion

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