算术表达式采用后缀式表示时不需要使用括号，使用（ ）就可以方便地进行求值。a-b*（c+d）的后缀式为（请作答此空）。
- A.a b c d- * +
- B.abcd* + -
- C.ab-c*d +
- D.abcd + *-
正确答案及解析
正确答案
解析
计算机在处理算术表达式时，首先将其转换为后缀表达式。例如，表达式“46+5*(120-37)”的后缀表达式形式为 “46512037-*+”。计算后缀表达式时，从左至右扫描后缀表达式：若遇到运算对象，则压入栈中,若遇到运算符，则从栈中弹出相关运算对象进行计算，并将运算结果压入栈中，重复以上过程，直到后缀表达式扫描结束。表达式“a-b*(b+d)”的后缀表达式形式为“abcd + * -。
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