求解cos（x）值

输入x值，按照公式计算cos(x)的值，直到最后一项小于10-6为止。

 

 1 package repeat_job1;
 2 
 3 public class Cos {
 4     public Cos(){}
 5     public static double cos(double x)
 6     {
 7         double cos=1,numerator=1,denominator=1;
 8         int k=1;
 9         while(Math.abs(numerator/denominator)>1e-6)
10         {
11             numerator*=x*x;
12             denominator *=- (2*k)*(2*k-1);
13             cos+=numerator/denominator;
14             k++;
15         }
16         return cos;
17     }
18     
19 
20 }

import repeat_job1.Cos;
import java.util.Scanner;
public class Test3 {
    public static void main(String[] args)
    {
        Scanner reader=new Scanner(System.in);
        System.out.println("请输入x：");
        double x=reader.nextDouble();
        reader.close();
        System.out.println("cos("+x+")="+Cos.cos(x));
    }

}

 

转载于:https://www.cnblogs.com/zyh2017/p/4996044.html