Thread: Generating random letters and numbers together

alright, I've done that but in another exercise I can't run it completely so can you help me to check what's wrong with it ? Thanks.

Write a JAVA program that calculates the surface area of a cylinder, C= 2( π r2) + 2 π r h, where r is the radius and h is the height of the cylinder. Allow the user to enter in a radius and a height. Format the output to three decimal places. Use the constant PI and the method pow() from the Math class.

This is what I've done:

/**
 * @(#)Ex5.java
 *
 *
 * @author
 * @version 1.00 2010/3/18
 */
 
import Java.util Scanner;
public class Ex5 {
 
    public static void main (String[] args)
    {
    	Scanner input.new Scanner(System.in);
    	double radius,height,area;
    	System.out.print("Please enter the radius of the Cylinder");
    	radius = input.nextDouble();
    	System.out.print("Please enter the height of the Cylinder");
    	height = input.nextDouble();
    	area = (height*2+Match+radius)+2*Math.PI+Math.POW(radius,2);
    	System.out.println("The surface of the cylinder" + area);
 
    }
 
 
}

Well your fomula is wrong. Why don't you make it like it is written in the question and see if that works? As for formatting to 3 decimal places check this out.

http://www.javaprogrammingforums.com...al-places.html

Actually your formula is very wrong just so you know π r(squared) is pi * radius(squared) not pi+radius squared your better off googling surface of cylinder or something.