回目錄

附錄 B 運算子與優先順序

原 Google Sites 連結：/cppzero/fu-lu-b-yun-suan-zi-yu-you-xian-shun-xu

C++ Reference

優先序 Precedence 運算子 Operator 運算類別 Description 結合性 Associativity
1 :: Scope resolution 左→右
2 a++   a-- Suffix/postfix increment and decrement
type()   type{} Functional cast
a() Function call
a[] Subscript
.   -> Member access
3 ++a   --a Prefix increment and decrement 右→左
+a   -a Unary plus and minus
!   ~ Logical NOT and bitwise NOT
(type) C-style cast
*a Indirection (dereference)
&a Address-of
sizeof Size-of
new   new[] Dynamic memory allocation
delete   delete[] Dynamic memory deallocation
4 .*   ->* Pointer-to-member 左→右
5 a*b   a/b   a%b Multiplication, division, and remainder
6 a+b   a-b Addition and subtraction
7 <<   >> Bitwise left shift and right shift
8 <=> Three-way comparison operator (since C++20)
9 <   <= For relational operators < and ≤ respectively
>   >= For relational operators > and ≥ respectively
10 ==   != For relational operators = and ≠ respectively
11 & Bitwise AND
12 ^ Bitwise XOR (exclusive or)
13 | Bitwise OR (inclusive or)
14 && Logical AND
15 || Logical OR
16 a?b:c Ternary conditional 右→左
throw throw operator
= Direct assignment (provided by default for C++ classes)
+=   -= Compound assignment by sum and difference
*=   /=   %= Compound assignment by product, quotient, and remainder
<<=   >>= Compound assignment by bitwise left shift and right shift
&=   ^=   |= Compound assignment by bitwise AND, XOR, and OR
17 , Comma 左→右