Thread: Help with Arrays - Counting elements

Hello everyone hows it going

I've only recently been introduced to arrays and require a bit of help with a small exercise I was doing earlier. Here is the question :

Write a program which reads a sequence of words, and prints a count of the number of distinct words. An example of input/output is

should I stay or should I go
5 distinct words

I have solved the question below, without using an array but I presume an array is what the question requires as the exercises are related to the sections being studied. Could anybody show me how I would use one in my solution instead?

 
public class Ex1
{
	public static void main(String[] args)
	{
		System.out.println("Enter Sentence:"); 
		int count=0;
		while(!Console.endOfFile())
		{
			String word = Console.readToken();
			if(word.length()> 1)
			{
				count++;
			}		
		}
		System.out.println("Number of distinct words is " + count);
 
	} // end of main
} // end of class

Originally Posted by Norm

You can't solve the problem without saving what has been read previously to compare against.
What is your count for this: This cat and This dog and This other dog

Count is 9. Its a distinct word if there is more then one letter. Im aware i havnt completely solved the question as i need an array. But how do I use one in a loop to check each word I enter to see if its length is greater than 1?

Its a distinct word if there is more then one letter

Are you sure about that definition? It doesn't make sense as an assignment.
I would think distinct meant the same as unique.

Originally Posted by Norm

Are you sure about that definition? It doesn't make sense as an assignment.
I would think distinct meant the same as unique.

haha it would seem ive totally misinterpreted the question. I'm such a noob. Sorry for wasting your time

Im gonna attempt it now, knowing what a distinct word actually is. I'll keep this thread unsolved incase i encounter another problem because im still trying to get my head around arrays

Cheers

Sorry but I'm still unsure as to how to keep going through the array and checking if a word is unique or not. All i know is that it's probably done in the for loop below with the question marks. Could anybody help me, i'm still confused with these

public class Ex1
{
	public static void main(String[] args)
	{
		String[] words = new String[10];
		System.out.println("Enter Sentence:");
		for(int i=0; i<words.length; i++)
		{
			words[i] = Console.readToken();
		}
		for(int i=0; i<words.length; i++)
		{
	                 ???
		}		
	}// end main
}// end class

Your posted code shows that you read words one after another into an array.

How would you do it if you were to do it manually with words written on a piece of paper?
Look at the next piece of paper, have I seen this word yet?
No, count it
Yes skip it

The trick here is to remember that you have seen the word before. Think about ways to do that