niudun11.java

数值分析之计算方法与实验2：方程求根 by java

import java.io.*;
class Niudun11{
  public static void main(String[]args)throws IOException{
  PrintWriter out = new PrintWriter(new FileWriter("result.txt"));
  double[] x=new double[200]; 
  double exp=0.5*Math.pow(10,-6);
  //误差限0.5x10^-6 
  int n=0;
  x[0]=-0.5;
  x[n+1]=x[n]-(x[n]*x[n]-Math.exp(x[n]))/(2*x[n]-Math.exp(x[n]));
       
  out.println("x[0]="+x[0]);
  while(n<100){
    x[n+1]=x[n]-(x[n]*x[n]-Math.exp(x[n]))/(2*x[n]-Math.exp(x[n]));
    out.println("x["+(n+1)+"]="+x[n+1]);    
    if(Math.abs(x[n+1]-x[n])<=exp)break;   
    n++;
  }
  out.close();
  }
}