jifen612.java

数值分析之计算方法与实验6：数值积分 by java

class Jifen612{
  static double Y(double x){
    if(x==0)return 1;
    else	
    return Math.sin(x)/x;
  }
  static double fkts(double a,double b,double n){
    double h=(b-a)/n;
    double c=0.0;
    for(int k=0;k<n;k++)
       c=c+(h/90)*(7*Y(a+k*h)+32*Y(a+k*h+0.25*h)+12*Y(a+k*h+0.5*h)+32*Y(a+k*h+0.75*h)+7*Y(a+k*h+h));
    System.out.println(c);   
    return c;
  }     
  public static void main(String[]args){
    fkts(0,1,2); 
    fkts(0,1,3);  
    fkts(0,1,4);   
  }
}