?? example4_11.java
字號:
import java.applet.*;
import java.awt.*;
public class Example4_11 extends Applet
{ public double f(double x)
{double y;
y=Math.exp(-x*x)-Math.tan(x)+800;
return y;}
public double mtcl(double x,double b,double eps)
{double r=0,y,y1=0;int m=0,n=0;
y=Math.abs(f(x));
while(y>eps&&n++<10000)
{ while(m++<100)
{r=Math.random()*2*b-b;
y1=Math.abs(f(x+r));
if(y1<y)break;
}
if(m>100)b/=2;
else {x+=r;y=y1;}
m=0;
}
return x;
}
public void paint(Graphics g)
{double x=Math.PI/4,b=Math.PI/4,eps=1e-7;
x=mtcl(x,b,eps);
g.drawString("X="+x,10,20);
}
}
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