Question

我正在尝试拆分包含几个选项的多项式字符串：

1.  "-x"
2.  "x"
3.  "-7","-70","-700" etc . . .
4.  "-7","-70","-700" etc . . .
5.  "-7x","-70x","-700x" etc . . .
6.  "7x","70x","700x" etc . . .
7.  "x^2","x^20","x^200" etc . . .
8.  "-x^2","-x^20","-x^200" etc . . .
9.  "-5x^5","-50x^50","-500x^500" etc . . .
10. "5x^5","50x^50","500x^500" etc . . .

我已成功使用str.split（）以单个术语分割多项式，如上所示。但是我想分开系数和指数。我不会在这里发布这个，除了我已经阅读了java正则表达式并且我不理解。

我读完了这个： https://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html

我想使用增强的for循环，因为我想在每个循环中省略字符串：

for (String term : polynomialTerm.split("x") {
    // for terms like these -5x, -50x, -500x && 5x, 50x, 500x
    // term will be the coefficient
}

for (String term : polynomialTerm.split("x^") {
    // for terms like these  x^2, x^20, x^200 && -2x^2, -20x^20, -200x^200 && 2x^2, 20x^20, 200x^200
    // term could be the coefficient or exponent
}

for (String term : polynomialTerm.split("-x^") {
    // for terms like these -x^2, -x^20, -x^200
    // term should then be the exponent
}

然后我将使用parseInt（）从if和else语句中获取循环中的系数或指数，以确保我获取正确的信息

对于多项式，String str.split（＆＃34;＆＃34;）的正确正则表达式

0 个答案: