数学运算符为Integer的字符串 [英] String with math operators to Integer

问题描述

我有一个带数学运算符的字符串，我需要将其转换为 int （答案）。

I have a string with math operators which I need to turn into an int (the answer).

下面的代码不起作用，但我不确定如何让答案变量起作用。

The below code does not work, but I'm not sure how I can get the answer variable to work.

String question;
int answer;

question = "7/7+9-9*5/5";
answer = Integer.parseInt(question);

推荐答案

Integer.parseInt（问题）; ...如果只是这么简单...

Integer.parseInt(question); ... If only it was so simple ...

你有一个数学表达式7 中缀符号中的/ 7 + 9-9 * 5/5您想要评估并将结果打印给用户。这样做的方法是使用<将其转换为后缀表示法，也称为反向波兰表示法。 a href =http://en.wikipedia.org/wiki/Shunting-yard_algorithm =nofollow> Shunting-yard算法。将表达式转换为postfix后，使用此算法非常简单

You have there a mathematical expression "7/7+9-9*5/5" in infix notation which you want to evalutate and print the result to the user. The way to do that is to convert it to postfix notation also known as Reverse Polish notation using the Shunting-yard algorithm. Once you have converted the expression to postfix evaluating is pretty easy using this algorithm

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