可利用一个栈来检查表达式中的括号是否匹配，其方法是：初始时设置栈为空， 然后从左到右扫描表达式，遇到左括号“(”就将其入栈，遇到右括号“)”就执行出栈操作，忽略其他符号。对于算术表达式“a*(b+c))d”,由于（ ）因此可判断出该表达式中的括号不匹配。
- A.需要进行出栈操作但栈已空
- B.需要进行入栈操作但栈已满
- C.表达式处理已结束，但栈中仍留有字符“(”
- D.表达式处理已结束，但栈中仍留有字符“)”
正确答案及解析
正确答案
解析
左括号入栈，右括号出栈，，该题中括号为：（）），所以当执行第2个右括号时，第一个左括号已经出栈了，栈为空栈。
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