precedence
operator
description
example
associativity1()
->.::
++--
grouping operator
array access
member access from a pointer
member access from an object
scoping operator
post-increment
post-decrement
(a + b) / 4;
array[4] = 2;
ptr->age = 34;
obj.age = 34;
class::age = 2;
for( i = 0; i < 10; i++ ) ...
for( i = 10; i > 0; i-- ) ...
left to right2!
~++---
+*&(type)
sizeof
logical negation
bitwise complement
pre-increment
pre-decrement
unary minus
unary plus
dereference
address of
cast to a given type
return size in bytes
if( !done ) ...
flags = ~flags;
for( i = 0; i < 10; ++i ) ...
for( i = 10; i > 0; --i ) ...
int i = -1;
int i = +1;
data = *ptr;
address = &obj;
int i = (int) floatnum;
int size = sizeof(floatnum);
right to left
3->*
.*member pointer selector
member pointer selector
ptr->*var = 24;
obj.*var = 24;
left to right4*
/%multiplication
division
modulus
int i = 2 * 4;
float f = 10 / 3;
int rem = 4 % 3;
left to right5+
-addition
subtraction
int i = 2 + 3;
int i = 5 - 1;
left to right
6<<
>>
bitwise shift left
bitwise shift right
int flags = 33 << 1;
int flags = 33 >> 1;
left to right
7<
<=
>
>=
comparison less-than
comparison less-than-or-equal-to
comparison greater-than
comparison geater-than-or-equal-to
if( i < 42 ) ...
if( i <= 42 ) ...
if( i > 42 ) ...
if( i >= 42 ) ...
left to right8==
!=comparison equal-to
comparison not-equal-to
if( i == 42 ) ...
if( i != 42 ) ...
left to right9&
bitwise and
flags = flags & 42;
left to right10^
bitwise exclusive or
flags = flags ^ 42;
left to right11|
bitwise inclusive (normal) or
flags = flags | 42;
left to right
12&&
logical and
if( conditiona && conditionb ) ...
left to right
13||
logical or
if( conditiona || conditionb ) ...
left to right
14? :
ternary conditional (if-then-else)
int i = (a > b) ? a : b;
right to left15=
+=-=
*=/=
%=&=
^=|=
<<=
>>=
assignment operator
increment and assign
decrement and assign
multiply and assign
divide and assign
modulo and assign
bitwise and and assign
bitwise exclusive or and assign
bitwise inclusive (normal) or and assign
bitwise shift left and assign
bitwise shift right and assign
int a = b;
a += 3;
b -= 4;
a *= 5;
a /= 2;
a %= 3;
flags &= new_flags;
flags ^= new_flags;
flags |= new_flags;
flags <<= 2;
flags >>= 2;
right to left16,
sequential evaluation operator
for( i = 0, j = 0; i < 10; i++, j++ ) ...
left to right
C 運算子優先順序列表
precedence operator description example associativity1 grouping operator array access member access from a pointer member access from an object scopin...
C 運算子優先順序列表
precedence operator description example associativity1 grouping operator array access member access from a pointer member access from an object scopin...
c 運算子優先順序列表
優先順序 運算子名稱或含義 使用形式 結合方向說明1 陣列下標 陣列名 常量表示式 左到右 圓括號 表示式 函式名 形參表 成員選擇 物件 物件.成員名 成員選擇 指標 物件指標 成員名2 負號運算子 表示式 右到左單目運算子 型別 強制型別轉換 資料型別 表示式 自增運算子 變數名 變數名 單目運...