/* A0510.java  ５章１．解答
 *    　　     exp 定積分 
 *         (C) H.Ishikawa 2008 
 */

package simulation;
import java.applet.*;
import java.awt.*;

public class A0510 extends Applet{

	public void paint(Graphics g) {
		int NUMBER =   10000;
		int    j;
		int    n1 = 0;
		double x0, y0;
		double s;
		for (j = 1; j <= NUMBER; j ++) {
			x0 = Math.random();
			y0 = Math.random();
			if (y0 < Math.exp(-x0)) {
				n1 = n1 + 1;
			}
		}
		s = (double)n1 / NUMBER;
		g.drawString("s =" + s, 10,  10);           
	}
}