操作符的结合性定义了相同优先级操作符组合的顺序(从右至左或从左至右)。
The associativity of an operator defines the order in which operators of the same precedence are grouped (right-to-left or left-to-right).
如果字符是个操作符，弹出(pop)操作符，直至遇见开括号(openingparenthesis)、优先级较低的操作符或者同一优先级的右结合符号。
If the character is an operator, pop operators until you reach an opening parenthesis, an operator of lower precedence, or a right associative symbol of equal precedence.
如果字符是个操作符，弹出(pop)操作符，直至遇见开括号(openingparenthesis)、优先级较低的操作符或者同一优先级的右结合符号。
If the character is an operator, pop operators until you reach an opening parenthesis, an operator of lower precedence, or a right associative symbol of equal precedence.
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