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  • C++运算符优先级

    PrecedenceOperatorDescriptionExampleAssociativity
    1 () [] -> . :: ++ -- 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 right
    2 ! ~ ++ -- - + * & (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 right
    4 * / % Multiplication Division Modulus int i = 2 * 4; float f = 10 / 3; int rem = 4 % 3; left to right
    5 + - 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 right
    8 == != Comparison equal-to Comparison not-equal-to if( i == 42 ) ... if( i != 42 ) ... left to right
    9 & Bitwise AND flags = flags & 42; left to right
    10 ^ Bitwise exclusive OR flags = flags ^ 42; left to right
    11 | 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 left
    15 = += -= *= /= %= &= ^= |= <<= >>= 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
    16 , Sequential evaluation operator for( i = 0, j = 0; i < 10; i++, j++ ) ... left to right

     来源:http://www.cppblog.com/aqazero/archive/2012/06/02/8284.html

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  • 原文地址:https://www.cnblogs.com/Miami/p/3006503.html
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