Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

macOS Java Help

H

Hylekmi

macrumors regular
Original poster
Dec 8, 2010
101
0
Hey guys, I am writing a program that fills an array of 100 with values from 1 to six( like a dice roll game) Then i have to count the number of times the integer appears. THEN i have to output an asterisk for the amount of time each number occurs. I have everything done up until the asterisk part. I can't figure it out to save my life. heres my code.

Code: 
public class finalJavaProject
{
	public static void main (String[]args)
	{	
		
		int numOne=0;
		int numTwo=0;
		int numThree=0;
		int numFour=0;
		int numFive=0;
		int numSix=0;
		char asterik ='*';
		
		
		
		int[] indRoll = new int[100];
		
		 for(int index=0;index<100;index++)
		 {
			 
			 
			 
			 indRoll[index]=(int) (Math.random()*6)+1;
			
			 if(indRoll[index]==1)
			 {
				 numOne++;
				 
				 System.out.print(asterik);
				
				 
			 }
			
			 if(indRoll[index]==2)
			 {
				 numTwo++;
				
				;
			 }
			 if(indRoll[index]==3)
			 {
				 numThree++;
			 }
			 if(indRoll[index]==4)
			 {
				 numFour++;
				 
			 }
			 if(indRoll[index]==5)
			 {
				 numFive++;
				 
			 }
			 if(indRoll[index]==6)
			 {
				 numSix++;
				 
			 }
			
			
		 }
		 System.out.println();
		 System.out.println("Number of 1's: "+numOne);
		 System.out.println("Number of 2's: "+numTwo);
		 System.out.println("Number of 3's: "+numThree);
		 System.out.println("Number of 4's: "+numFour);
		 System.out.println("Number of 5's: "+numFive);
		 System.out.println("Number of 6's: "+numSix);
		 System.out.println();
		 System.out.println();
		 System.out.println();
		 System.out.println();
		 System.out.println();
		 
	}//end main
	

}//end public


I can out put the correct number of asterisks for the first digit. But i need it to be seperate from the rest of it. The point of the asterisks is to make it look like a graph.

This assignment basically determines if i pass the class or not so any help would be greatly appreciated. Thanks in advance!
 
Just make a loop for each number 1-6, that runs the amount of times that number was rolled. And each time you go through the loop, print one asterisk (but don't print a 'return' or end of line.

Also, you might want to use a switch statement instead of a bunch of if statements.
 
robvas said:
Just make a loop for each number 1-6, that runs the amount of times that number was rolled. And each time you go through the loop, print one asterisk (but don't print a 'return' or end of line.

Also, you might want to use a switch statement instead of a bunch of if statements.
Click to expand...

Thats a good idea. Thanks, I haven't learned what a switch statement is yet so i can't use it. Thanks though!
 
Code: 
public class FinalJavaProject
{
	public static void main (String[] args)
	{	
		int numOne = 0;
		int numTwo = 0;
		int numThree = 0;
		int numFour = 0;
		int numFive = 0;
		int numSix = 0;
		char asterik = '*';

		int[] indRoll = new int[100];

		for(int index = 0; index < 100; index++)
		{
			indRoll[index] = (int)(Math.random() * 6) + 1;
			switch(indRoll[index])
			{
				case 1:
					numOne++;
					break;
				case 2:
					numTwo++;
					break;
				case 3:
					numThree++;
					break;
				case 4:
					numFour++;
					break;
				case 5:
					numFive++;
					break;
				case 6:
					numSix++;
					break;
			}
		}
		
		printOccurrences(1, numOne, asterik);
		printOccurrences(2, numTwo, asterik);
		printOccurrences(3, numThree, asterik);
		printOccurrences(4, numFour, asterik);
		printOccurrences(5, numFive, asterik);
		printOccurrences(6, numSix, asterik);
	}//end main
	
	private static void printOccurrences(int number, int occurrences, char symbol)
	{
		System.out.print("Number of " + number + "'s: ");
		for(int i = 0; i < occurrences; i++)
		{
			System.out.print(symbol);
		}
		System.out.println(" (" + occurrences + ")");
	}
}//end public
 
Ok, I can't use that because we haven't learned that yet. Im still stuck on making the loop though. I can't get it to output the correct results.
Code: 
public class finalJavaProject
{
	public static void main (String[]args)
	{	
		
		int numOne=0;
		int numTwo=0;
		int numThree=0;
		int numFour=0;
		int numFive=0;
		int numSix=0;
		
		int count=0;
		
		
		
		
		int[] indRoll = new int[100];
		
		 for(int index=0;index<100;index++)
		 {
			 
			 
			 
			 indRoll[index]=(int) (Math.random()*6)+1;
			
			 if(indRoll[index]==1)
			 {
				 numOne++;	
				 
			 }
			 if(indRoll[index]==2)
			 {
				 numTwo++;
			 }
			 if(indRoll[index]==3)
			 {
				 numThree++;
			 }
			 if(indRoll[index]==4)
			 {
				 numFour++;
				 
			 }
			 if(indRoll[index]==5)
			 {
				 numFive++;
				 
			 }
			 if(indRoll[index]==6)
			 {
				 numSix++;
			 }
			for(int i=0;i==numOne;i++)
			{
				count++;
				System.out.println(count);
			}
		 }
		
		 System.out.println();
		 System.out.println("Number of 1's: "+numOne);
		 System.out.println("Number of 2's: "+numTwo);
		 System.out.println("Number of 3's: "+numThree);
		 System.out.println("Number of 4's: "+numFour);
		 System.out.println("Number of 5's: "+numFive);
		 System.out.println("Number of 6's: "+numSix);
		 System.out.println();
		 System.out.println();
		 System.out.println();
		 System.out.println();
		 System.out.println();
		 
		
				
				
	}//end main
	

}//end public


----------

Got it!
 
I wrote the loop for you if the previous post...

I put the switch statement in for demo purposes.

You don't need an if/switch statement inside the first loop if you use another array store the totals.

Code: 
public class FinalJavaProject
{
	public static void main (String[] args)
	{
		char asterik = '*';
		int rolls = 100;
		int maxDieNumber = 6;
		int[] indRoll = new int[rolls];
		int[] occurrences = new int[maxDieNumber];

		for(int index = 0; index < rolls; index++)
		{
			indRoll[index] = (int)(Math.random() * maxDieNumber) + 1;
			occurrences[indRoll[index] - 1]++;
		}
		
		printOccurrences(occurrences, asterik);
	}//end main
	
	private static void printOccurrences(int[] occurrences, char symbol)
	{
		for(int i = 0; i < occurrences.length; i++)
		{
			System.out.print("Number of " + (i + 1) + "'s: ");
			printSymbol(symbol, occurrences[i]);
			System.out.println(" (" + occurrences[i] + ")");
		}
	}
	
	private static void printSymbol(char symbol, int repeat)
	{
		for(int i = 0; i < repeat; i++)
		{
			System.out.print(symbol);
		}
	}
}//end public
 
Last edited:
Example:
Code: 
for ( int i = 0; i < someNumber; i++ )
{  System.out.print( "*" );  }
System.out.println();
This is basically what elppa posted, only he put it in a separate method. If you don't understand what it does, step through it by hand. Imagine someNumber has the value 5. What output is produced? Now imagine someNumber has the value 11. What's the output? The way I'd describe this loop is it outputs one asterisk for each incremental count of i.

If you know how arrays work, why are you keeping six separate variables? Seems like a perfect opportunity to have an array of six counters, and you increment the one whose number appears in the array of 100.
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom
Back