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Message:

HelloWorld program

Posted by David Lowe on September 24, 2000 at 9:01 PM

I've never programmed before in Java, actually I've never programmed, period. I'm attempting to teach myself. I was looking at the HelloWorld program below:

// A simple program to print out the string "HelloWorld".

public class HelloWorld
{

/* Applications always execute the main method of
the class first.

@param args[] contains the command line arguments.
*/

public static void main(String args[])
{
System.out.println("Hello world!");
}

}

Suppose I wanted the program to echo the number of runtime arguments. For instance, if I type java HelloWorld this is a test
the output should be 4 because there are four arguments passed to the program. (The name of the program is HelloWorld)

What if I wanted the program to echo the factorial of the number of arguments to the program. For instance, if I type java HelloWorld this is a test the output should be 24 (= 4 x 3x 2 x 1), which is the factorial of 4.

What changes would I have to make to the above code. I tried the following but it gives a blank answer:

/*A simple program to echo the number of runtime
arguments*/

public class HelloWorld
{
public static void main (String args[])
{
for (int i = 0; i < args.length; i++)
{
System.out.print(args[i]+" ");
}
System.out.println(" ");
}
}

Thanks in advance.

• sample code... Jeff Kinsey September 25, 2000 at 12:38 PM (1)
  • dd ddd November 15, 2000 at 9:53 PM (0)