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Making a program that counts the # of characters

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leroi green leroi green is offline

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Making a program that counts the # of characters

Nov 8th, 2007

the below program is supposed to read the string you input and count the amount of times that the letter 'a' appears in it. if it doesn't find the letter 'a', it's supposed to tell you that there aren't enough arguments (which i may change to say that "there aren't any 'a' characters or something) but i'm stuck and i don't know exactly what else to do.

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
//Page 297 Exercise 8.4
//Saying program found x # of this character in string.
 
 
public class Test
 
{
//variables
 
char a = a;
 
{
  public static void main(String[] args)
  {
    if (args.length != 2)
    {
      System.out.println("Not enough arguments");
    }
    else
       {
      Count(args[0], args[1].charAt(0));
       }
  }
 
public static int Count(String str, char a)
{
  int charCount = 0;
 
   System.out.print(str);
   System.out.print(a);
 
  for (int i = 0; i<str.length(); i++)
  {
  if (str.charAt(i) == a)
    {
      charCount ++;
    }
 
  return charCount;
    }
   }
  }
}
//Page 297 Exercise 8.4
//Saying program found x # of this character in string.


public class Test

{
//variables

char a = a;

{
  public static void main(String[] args)
  {
    if (args.length != 2)
    {
      System.out.println("Not enough arguments");
    }
    else
       {
      Count(args[0], args[1].charAt(0));
       }
  }

public static int Count(String str, char a)
{
  int charCount = 0;

   System.out.print(str);
   System.out.print(a);

  for (int i = 0; i<str.length(); i++)
  {
  if (str.charAt(i) == a)
    {
      charCount ++;
    }
    
  return charCount;
    }
   }
  }
}

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Re: Making a program that counts the # of characters

Nov 8th, 2007

What exactly is the problem? Other than the fact, of course, that the method you're calling returns a value and you are simply ignoring that value, rather than storing it in a variable, evaluating it, then printing either it or the message.

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----------------------------------------------

Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan

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Re: Making a program that counts the # of characters

Nov 8th, 2007

... and also that

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char a = a;

won't compile...

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Re: Making a program that counts the # of characters

Nov 8th, 2007

what should i do about that part that won't compile because i don't see why its going thru on the cmd but then not working

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Re: Making a program that counts the # of characters

Nov 8th, 2007

A char literal needs to be in single quotes

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Java Syntax (Toggle Plain Text)

char a = 'a';

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Re: Making a program that counts the # of characters

Nov 8th, 2007

okay okay, thanx

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Re: Making a program that counts the # of characters

Nov 8th, 2007

oh i also just noticed that i totally had the main method in the wrong place. trying to compile now.

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Re: Making a program that counts the # of characters

Nov 8th, 2007

now i'm working with the below code that's compiling and going 'sort-of' where i want but the number that it is giving for the amount of times 'a' shows up is strange like 000000111

Help?

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
public class Test
 
{
	//variables
	char a = 'a';
 
	public static void main(String[] args)
 
	{
		if (args.length < 1)
		{
			System.out.println("Not enough arguments");
		}
		else
		{
			Count(args[0], args[1].charAt(0));
		}
	}
 
	public static int Count(String str, char a)
	{
		int charCount = 0;
 
		System.out.print("The number of character 'a' found is: ");
 
 
		for (int i = 0; i<str.length(); i++)
		{
			if (str.charAt(i) == a)
			{
				charCount ++;
			}
			System.out.print(charCount);			
		}
		return charCount;
	}
}
public class Test

{
	//variables
	char a = 'a';

	public static void main(String[] args)

	{
		if (args.length < 1)
		{
			System.out.println("Not enough arguments");
		}
		else
		{
			Count(args[0], args[1].charAt(0));
		}
	}

	public static int Count(String str, char a)
	{
		int charCount = 0;

		System.out.print("The number of character 'a' found is: ");


		for (int i = 0; i<str.length(); i++)
		{
			if (str.charAt(i) == a)
			{
				charCount ++;
			}
			System.out.print(charCount);			
		}
		return charCount;
	}
}

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Re: Making a program that counts the # of characters

Nov 8th, 2007

Have you tried regex? Also an amazing program for Java is Eclipse, with it you wont need to run the program through cmd, although I would recommend that you run it through cmd before you submit your code. Look up Eclipse, it will save you many a frustrated hour.

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duckman

Re: Making a program that counts the # of characters

#10

Nov 9th, 2007

why are you printing the count inside the loop?
why are you not doing anything with the returnvalue of the method?

and don't use Eclipse or any other IDE until you know the language. Those things slow down your learning by making you learn the tool and masking your own misunderstanding in places.

As people are clearly allowed to attack me but I'm not allowed to defend myself, I no longer post to this site.