im not familiar with boolean in method...

[PureAwesomeness]

i have trouble with the highlighted part and im not familar with boolean. the reason that i used it in my code because the problem required it.

import util.java.Scanner;
public class CreditCard
{
	public static void main(String[]args)
	{

	Scanner input = new Scanner(System.in);

	System.out.println("Enter the 16-digits of Credit Card number for vaildation.");
		long cardNum = input.nextInt();

	System.out.println(cardNum+isValid());

}
//Vaild
	[COLOR="SeaGreen"]public boolean isValid(long number)
	{
	int sum = sumOfEvenPlace() + sumOfOddPlace();
	if (sum%10 ==0 ){
	 return 'is valid';
	}
	if (sum%10 != 0){
	 return 'is invalid';
	}
}[/COLOR]
//Even
	public static int sumOfEvenPlace(long number)
	{
	int total= 0;

	for (int i = 2; i<=16; i += 2)
	{
		int even = (cardNum/(Math.pow(10,i-2)))%10;
		if (even > 4){
		even = getDigit();
	}
		total += even;
	}
	return total;
	}
//Digit
	public static int getDigit(int number)
	{
		int Over = even*2;
		int fir =Over/10;
		int sec = Over%10;
		even = fir + sec;
		return even;
		}

//Odd

	public static int sumOfOddPlace(long number)
	{
	int total1=0;
	for (int j=1; j<=15; j +=2)
	{
	int odd = (cardNum / Math.pow(10,j))%10;
		total += odd;
	}
	return total1;
	}

}

[emceenugget]

boolean is a primitive type with value either true or false.

[PureAwesomeness]

boolean is a primitive type with value either true or false.

i know the definition but not sure how to apply it.
so what are suggesting me to do?
change those ifs statments to true or false?

[angryboy]

why don't you try it and see if it produce the result you wanted.

[PureAwesomeness]

public boolean isValid(long number)
{
int sum = sumOfEvenPlace() + sumOfOddPlace();
true (sum%10 ==0 ){
return 'is valid';
}
false (sum%10 != 0){
return 'is invalid';
}
}

it doesnt work =[

[PureAwesomeness]

public boolean isValid(long number)
	{
	int sum = sumOfEvenPlace() + sumOfOddPlace();
	true (sum%10 ==0 ){
	 return 'is valid';
	}
	false (sum%10 == 0){
	 return 'is invalid';
	}
}

it doesnt work =[

[angryboy]

change those ifs statments to true or false?

why didn't you try it...

what is 'is valid' and 'is invalid' ?? thats not a valid statement you know.

[angryboy]

oh! lol you literally change the if to true and false. didn't catch that.

nono you have to do this:
if (somehting) return true;

[PureAwesomeness]

how can i return a "system.out.println" statment in that method?

[angryboy]

u can't........9A

[PureAwesomeness]

the how am i gonna use "return true" or "return false"?

[MK12]

you could execute a print() method, but if thats all you're going to do then it should be declared void. It should be:
if(sum % 10 == 0) { return false; }
-MK12

[PureAwesomeness]

print isValid(); when i put this in theres an error come up that i need a semicolon.
and i cant declare void because the instructions said so.=[

[PureAwesomeness]

like this
C:\Documents and Settings\HP_Administrator\Desktop\CreditCard.java: 12: ';' expected
print isValid();
^

[PureAwesomeness]

this is the modified version
the error came up on the highlighted part
and the "System.out.println" any suggestion on how i need to change it to display that?

import java.util.Scanner;
public class CreditCard
{
	public static void main(String[]args)
	{

	Scanner input = new Scanner(System.in);

	System.out.println("Enter the 16-digits of Credit Card number for vaildation.");
		long cardNum = input.nextInt();

[COLOR="Green"]	print isValid(); [/COLOR]

}
//Vaild
	public boolean isValid(long number)
	{
	int a =	sumOfEvenPlace();
	int b = sumOfOddPlace();
	int sum = a + b;
	if(sum%10 ==0 ){
	 return true;
	[COLOR="Green"] System.out.println(number+"is valid");[/COLOR]

	}
	else
	return false;
	 [COLOR="Green"]System.out.println(number+"is invalid");[/COLOR]

}
//Even
	public static int sumOfEvenPlace(long number)
	{
	int total= 0;

	for (int i = 2; i<=16; i += 2)
	{
	int even = ((int)(number/(Math.pow(10,i-2))))%10;
		if (even > 4){
		even = getDigit();
	}
		total += even;
	}
	return total;
	}
//Digit
	public static int getDigit(int number)
	{
		int Over = number*2;
		int fir =Over/10;
		int sec = Over%10;
		number = fir + sec;

		return number;
		}

//Odd

	public static int sumOfOddPlace(long number)
	{
	int total1=0;
	for (int j=1; j<=15; j +=2)
	{
	int odd = ((int)(number / Math.pow(10,j)))%10;
		total1 += odd;
	}
	return total1;
	}

}

[angryboy]

what mk12 meant was this

	[B]isValid(); [/B]
}
//Vaild
	public [B]void[/B] isValid(long number)
	{
	int a =	sumOfEvenPlace();
	int b = sumOfOddPlace();
	int sum = a + b;
	if(sum%10 ==0 ){
	[B] //return true;[/B]
	 System.out.println(number+"is valid");

	}
	else
	[B]//return false;[/B]
	 System.out.println(number+"is invalid");

[MK12]

Yes I just didn't include the System.out.
-MK12

[PureAwesomeness]

yea i know what he meant but the instructions said i need to use

public boolean isValid(long number)
	{

[MK12]

public boolean isValid(long number) {
	int a = sumOfEvenPlace();
	int b = sumOfOddPlace();
	int sum = a + b;
	if(sum % 10 == 0){
	          return true;
	}
	else {
	          return false;
        }
}

And then in the code that uses the isValid method, do this:

String valid = (isValid([COLOR="Red"]12[/COLOR]))? "It's Valid!" : "Invalid.. try again";
System.out.println(valid);

change the number 12 in red to whatever you need.. and change the It's Valid/invalid messages if you wish. Hope that helped.

Actually, a better way would be this:

System.out.println((isValid([COLOR="Red"]12[/COLOR]))? "It's Valid!" : "Invalid.. try again");

I think that would work too, and would mean no unecassary variable.
-MK12

[angryboy]

mk12 makes very good use of ?: operator, but might be a bit confusing for new comers. here's an inferior version.

boolean b = isValid(12);
if(b)   System.out.println("valid");
else   System.out.println("not valid");

edit:
if the post is solved, please mark it as solved.

edit2:
also, the method could be:

return sum % 10 == 0 ? true : false;