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  • C++ Operator Precedence

    C++ Operator Precedence

    The operators at the top of this list are evaluated first.

    Precedence Operator Description Example Associativity
    1 ::
    Scoping operator
    Class::age = 2;
    none
    2 ()
    []
    ->
    .
    ++
    --
    Grouping operator
    Array access
    Member access from a pointer
    Member access from an object
    Post-increment
    Post-decrement
    (a + b) / 4;
    array[4] = 2;
    ptr->age = 34;
    obj.age = 34;
    for( i = 0; i < 10; i++ ) ...
    for( i = 10; i > 0; i-- ) ...
    left to right
    3 !
    ~
    ++
    --
    -
    +
    *
    &
    (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
    4 ->*
    .*
    Member pointer selector
    Member object selector
    ptr->*var = 24;
    obj.*var = 24;
    left to right
    5 *
    /
    %
    Multiplication
    Division
    Modulus
    int i = 2 * 4;
    float f = 10 / 3;
    int rem = 4 % 3;
    left to right
    6 +
    -
    Addition
    Subtraction
    int i = 2 + 3;
    int i = 5 - 1;
    left to right
    7 <<
    >>
    Bitwise shift left
    Bitwise shift right
    int flags = 33 << 1;
    int flags = 33 >> 1;
    left to right
    8 <
    <=
    >
    >=
    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 right
    9 ==
    !=
    Comparison equal-to
    Comparison not-equal-to
    if( i == 42 ) ...
    if( i != 42 ) ...
    left to right
    10 & Bitwise AND flags = flags & 42; left to right
    11 ^ Bitwise exclusive OR flags = flags ^ 42; left to right
    12 | Bitwise inclusive (normal) OR flags = flags | 42; left to right
    13 && Logical AND if( conditionA && conditionB ) ... left to right
    14 || Logical OR if( conditionA || conditionB ) ... left to right
    15 ? : Ternary conditional (if-then-else) int i = (a > b) ? a : b; right to left
    16 =
    +=
    -=
    *=
    /=
    %=
    &=
    ^=
    |=
    <<=
    >>=
    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 left
    17 , Sequential evaluation operator for( i = 0, j = 0; i < 10; i++, j++ ) ... left to right
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  • 原文地址:https://www.cnblogs.com/wubiyu/p/1256230.html
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