Fg For Halp - Topic

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Joined: Apr 28 2006

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Apr 28 2013 02:59pm

i'm taking a javascript class and need some relatively simple help. here's the assignment:
Write, compile, and execute a Java application program that counts down by 2’s
beginning with a user-input number. Your program should follow these steps:
1. Have the user input a positive integer starting value. Validate that they have input a positive
number, giving them as many chances as necessary to do so.
2. Use a while-loop to count down from the starting value by 2’s, outputting one value at a time,
and stopping when the value becomes negative (see example below).
3. Output “DONE”.

what i've done so far is:
public class while
{
public static void main (String [] args)
{

int numTimes, num;

num = Input.readInt("Enter a number: ");
while (num < 0)
numTimes = Input.readInt("Please enter a positive number: ");

while (num > 0)
{
Output.showValue("Number:", tipValues);
count = count - 2;
while (numTimes < 0);

}

}
}

for some reason i got this error 7 times... "while.java:10: illegal start of expression public static void main (String [] args)"

let me know if anyone has ideas
thanks

m0hawk

Member

Posts: 1,241

Joined: Jun 25 2011

Gold: Locked

Apr 28 2013 03:24pm

ok first off Javascript and Java are two COMPLETELY differents things.
second your code is very messed up, was it supposed to be a draft or something? :rofl:

Here's a possible corrected code, put it in a CountsDownBy2.java file:

Code

import java.util.Scanner;

public class CountsDownBy2 {
public static void main(String[] args) {
int num = -1;
Scanner s = new Scanner(System.in);
while (num < 0) {
System.out.print("Enter a number: ");
num = s.nextInt();
}
while (num >= 0) {
System.out.println("Number: " + num);
num -= 2;
}
System.out.println("DONE");
}
}

This post was edited by m0hawk on Apr 28 2013 03:31pm

carteblanche

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Gold: 3,804.50

Apr 28 2013 03:28pm

Among other problems, you're using a keyword for your class name.

labatymo

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Joined: Nov 26 2007

Gold: 1,214.81

Apr 29 2013 07:15am

Code

import java.util.Scanner;

public class Main {
public static void main( String[] args ) {

/*
* 1. Have the user input a positive integer starting value. Validate that
* they have input a positive number, giving them as many chances as
* necessary to do so.
*/

int input;

while ( true ) {
System.out.println( "Enter a positive integer: " );
input = new Scanner( System.in ).nextInt( );
if ( input < 0 ) {
System.out.println( "Invalid input" );
continue;
} else {
break;
}
}

/*
* 2. Use a while-loop to count down from the starting value by 2’s,
* outputting one value at a time, and stopping when the value becomes
* negative (see example below).
*/

while ( input >= 0 ) {
System.out.println( input -= 2 );
}

/* 3. Output “DONE”. */
System.out.println( "DONE" );
}
}

This post was edited by labatymo on Apr 29 2013 07:17am

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