Java Compile error

[pablo2002]

Have a variable error on this module. I cannot fiqure out why.

System.out.print("set #" + k + " = ");
for(int i=0; i <= 6; i++)
System.out.print(NoDuplicateNumbers[i] + ", ");

The rest of code applet. Just need a hint, please.

public class Week3IPSolutionSkeleton {

	
public static void main(String [] args) {


			
int[] NoDuplicateNumbers = {0,0,0,0,0,0,0};
			
int IndexOfNoDuplicateNumbers=0;
			
boolean match = false;



				
for (int k=1; k <= 8; k++)

				// Keep doing till you get 7 no duplicate numbers
				while (IndexOfNoDuplicateNumbers < 7)
				{
					int Number = ((int) (35 * Math.random() ) + 1);
					System.out.println(Number);

					for (int i=0; i < IndexOfNoDuplicateNumbers; i++)
						if ( Number == NoDuplicateNumbers[i] )
						{
							match = true;
							break;
						}

					if (match == true)
					{
						match = false;
					}
					else
					{
						NoDuplicateNumbers[IndexOfNoDuplicateNumbers] = Number;
						IndexOfNoDuplicateNumbers++;
					}

				}

				//Print 7 and no duplicate numbers for the rest
				System.out.print("set #" + k + " = ");
				for(int i=0; i <= 6; i++)
				System.out.print(NoDuplicateNumbers[i] + ", ");



				// Print the powerball number
				System.out.print( (int) (10 * Math.random() ) + 1);


				System.out.println();
				System.out.println();


				// initialize for next set of 7 numbers
				for (int i=0; i<7; i++)
					NoDuplicateNumbers[i] = 0;
				IndexOfNoDuplicateNumbers=0;
				match = false;


		}

}

[Fubarable]

Hello and welcome to the forum! I've edited your post above to add code tags so that the code will retain its formatting.

Can you tell us what the error is and which line causes it?

[Fubarable]

Suggestion: place all for loops, if blocks, while loops, and similar within curly braces even if only one line. For instance instead of this:

      for (int i = 0; i <= 6; i++)
         System.out.print(NoDuplicateNumbers[i] + ", ");

do this:

      for (int i = 0; i <= 6; i++) {
         System.out.print(NoDuplicateNumbers[i] + ", ");
      }

This will save your tail many times, and may even help you solve your current problem. ;)

[pablo2002]

The error is on this module.

/Print 7 and no duplicate numbers for the rest
System.out.print("set #" + k + " = ");
for(int i=0; i <= 6; i++)
System.out.print(NoDuplicateNumbers[i] + ", ");

Line 40
Cannot find symbol k
System.out.print("set #" + k + " = ");

Their is mark on "K"

[Fubarable]

You have a scope issue -- a variable that you're trying to use is not in scope; it is visible within the for loop but not before the loop nor after it. If you take my suggestion above regarding the curly braces, you'll know better if the variable "k" is in the same scope as the k variable declared in the for loop.

[pablo2002]

I did add the brackets. Re compiled and received the same error. The variable is delcared and is with scope of java app. If I declare it again, it will casue another error.

It is declared here "for (int k=1; k <= 8; k++)"

[Fubarable]

I did add the brackets. Re compiled and received the same error. The variable is delcared and is with scope of java app. If I declare it again, it will casue another error.

It is declared here "for (int k=1; k <= 8; k++)"

Yep, it is declared there, and thus it is only visible within the for loop itself:

// k is not visible here as it is out of scope

for (int k=1; k <= 8; k++) {
   
   // here inside of the for loop, k is in scope and is visible

} // end of for loop block

// k is not visible here as it is again out of scope

Hopefully the curly braces and comments above will help you see where k is in scope.

[pablo2002]

You were correct! I changed and put my curly brackets in the correct spots and it worked. Thank you for your help most sincerely! :)

[Fubarable]

You were correct! I changed and put my curly brackets in the correct spots and it worked. Thank you for your help most sincerely! :)

Wonderful, and you're welcome, most sincerely! :)