小编awd*_*reg的帖子

我正在制作一个衍生计算器,询问用户多项式的程度,然后是每个项的系数,部分原因是因为我是一个没有经验的程序员,无法解析输入3x^4/4 + sin(x).

这是我的课.

package beta;

import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JOptionPane;

public class DerivativeCalculator 
{
    public DerivativeCalculator(String d, String v)
    {
        int degree = Integer.parseInt(d);

        double value = Double.parseDouble(v);

        coeffList = new ArrayList<Double>();
        for (int i = 0; i <= degree; i++)
        {
            String console = JOptionPane.showInputDialog("Enter the coefficient of the "
                    + "x^" + i + " term.");
            Double coeff = Double.parseDouble(console);

            coeffList.add(coeff);
        }

    }
    public double calc()
    {
        double dx = …