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User input at runtime?? [message #128532]

Mon, 09 January 2006 12:24

Eclipse User

Originally posted by: asdad.asd.com

I have this in a java file:

public class Fibonacci{
public static void main (String[] args) {
int theNum, theFib;

System.out.println("This program computes the kth " +
"Fibonacci number.");
System.out.print("Enter the number k: ");
theNum = new Integer(args[0]).intValue();

but to get input in theNum I need to specify it under Run...Is there no way
to enter input when I run the program?

Re: User input at runtime?? [message #128545 is a reply to message #128532]

Mon, 09 January 2006 12:37

Eclipse User

You're reading the command line argument arg[0] as input. If you want to
read console-based input at runtime you'll have to use System.in.read()

- Jeff

Re: User input at runtime?? [message #128558 is a reply to message #128545]

Mon, 09 January 2006 13:10

Eclipse User

Originally posted by: asdad.asd.com

Jeff Myers wrote:

> You're reading the command line argument arg[0] as input. If you want to
> read console-based input at runtime you'll have to use System.in.read()
>
> - Jeff

I can now type something in the console but it never gets used:

import java.io.IOException;

public class Fibonacci{
public static void main (String[] args) throws IOException {
int theFib, theNum;

System.out.println("This program computes the kth " +
"Fibonacci number.");
System.out.print("Enter the number k: ");
theNum= System.in.read();

theFib = fib(theNum);

System.out.println("The " + theNum + "th Fibonacci " +
"number = " + theFib + ".");
}

/**
* Recursively calcualte the kth Fibonacci number.
*
* @param k indicates which Fibonacci number to compute.
* @return the kth Fibonacci number.
*/
static int fib(int k) {

// Base Case:
// If k <= 2 then fib(k) = 1.
if (k <= 2) {
return 1;
}
// Recursive Case:
// If k > 2 then fib(k) = fib(k-1) + fib(k-2).
else {
return fib(k-1) + fib(k-2);
}
}
}

Re: User input at runtime?? [message #128582 is a reply to message #128558]

Mon, 09 January 2006 13:45

Eclipse User

Originally posted by: nobody.there.127.0.0.1

Paminu wrote:
> theNum= System.in.read();
>
> theFib = fib(theNum);

This almost certainly isn't what you intend to do. I'd recommend a
closer look at
http://java.sun.com/j2se/1.4.2/docs/api/java/io/InputStream. html#read()
- a good Java book should be able to give you more details on its use.

Andrew Jr.

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