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How DO you count Upper Case letters?

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jengels

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How DO you count Upper Case letters?

Mar 31st, 2005

I am writing a java program. One of the functions of my program is to count all the uppercase letters in a paragraph of text I import. I am not sure how to set this up.
Is it something like,

isUpperCase.(char)

Any help would be great

Thanks

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Re: How DO you count Upper Case letters?

Mar 31st, 2005

Maybe something like this would work, but I'm not sure:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
 
String text = textArea.getText();
int upperCaseCount = 0;
 
for (int i=0; i<text.length(); i++)
{
     for(char c='A'; c<='Z'; c++)
    {
           if (text.charAt(i) == c)
          {
                    upperCaseCount++;
          }
     }
}
String text = textArea.getText();
int upperCaseCount = 0;

for (int i=0; i<text.length(); i++)
{
     for(char c='A'; c<='Z'; c++)
    {
           if (text.charAt(i) == c)
          {
                    upperCaseCount++;
          }
     }
}

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Re: How DO you count Upper Case letters?

Mar 31st, 2005

Here's a real example of it:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
class UCase
{
  public static void main(String[] args)
  {
	String s = "This has Three Upper case characters";
	int upperCaseCount = 0;
 
	for (int i=0; i<s.length(); i++)
	{
    		 for(char c='A'; c<='Z'; c++)
    		{
        		   if (s.charAt(i) == c)
          		   {
                    		upperCaseCount++;
          		   }		
     		}
	}
	System.out.println(upperCaseCount + "");
  }
}
class UCase
{
  public static void main(String[] args)
  {
	String s = "This has Three Upper case characters";
	int upperCaseCount = 0;

	for (int i=0; i<s.length(); i++)
	{
    		 for(char c='A'; c<='Z'; c++)
    		{
        		   if (s.charAt(i) == c)
          		   {
                    		upperCaseCount++;
          		   }		
     		}
	}
	System.out.println(upperCaseCount + "");
  }
}

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tonakai

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Re: How DO you count Upper Case letters?

Apr 1st, 2005

you can look at the values of the character, (for ASCII code table)
for example value of 'A' is 65 and value of 'Z' is 90
so you can check every character in your string, then check if characters are between 65 and 90, if true then increase counter, if false do nothing.

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Re: How DO you count Upper Case letters?

Apr 1st, 2005

I'd expect a regular expression that extracts all uppercase letters into a new String, followed by simply taking the length of that String, to be the shortest code.
The regular expression could get messy though, and not being an expert at them I'm not going to try writing one

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Re: How DO you count Upper Case letters?

Apr 1st, 2005

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Originally Posted by jwenting

I'd expect a regular expression that extracts all uppercase letters into a new String, followed by simply taking the length of that String, to be the shortest code.
The regular expression could get messy though, and not being an expert at them I'm not going to try writing one

You could use the same thing I gave and still be able to easily extract them and put the UCase characters in a new string.

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Re: How DO you count Upper Case letters?

Apr 1st, 2005

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Originally Posted by tonakai

you can look at the values of the character, (for ASCII code table)
for example value of 'A' is 65 and value of 'Z' is 90
so you can check every character in your string, then check if characters are between 65 and 90, if true then increase counter, if false do nothing.

Exactly what I did, except I made it much easier.

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Re: How DO you count Upper Case letters?

Apr 1st, 2005

well your code is a bit slower, because in every character your program compare with the whole alphabet, but mine only with two number,
so in a string with 5 character,
yours, 5*26 comparison,
mine, only 5*2

accually when string is very long, both algorithm's time gets closer... both algorithm's speed is O(n) where n is the length of the string.

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Re: How DO you count Upper Case letters?

Apr 1st, 2005

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Originally Posted by tonakai

well your code is a bit slower, because in every character your program compare with the whole alphabet, but mine only with two number,
so in a string with 5 character,
yours, 5*26 comparison,
mine, only 5*2

accually when string is very long, both algorithm's time gets closer... both algorithm's speed is O(n) where n is the length of the string.

I compare only with uppercase character just as you do. Not meaning to be rude here, but how do you get 5 *2? I mean, don't you have to compare each character with all the ASCII codes pertaining to u case char's?

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Re: How DO you count Upper Case letters?

#10

Apr 1st, 2005

Also, how would you do this? would it be something like this:

 Help with Code Tags 
 Java Syntax (Toggle Plain Text) 
for (int i=0; i<text.length(); i++)
{
   int charPoint = (char)text.charAt(i);
  if (charPoint >= 65 && charPoint <= 90)
  {
     //its ucase
  }
}
for (int i=0; i<text.length(); i++)
{
   int charPoint = (char)text.charAt(i);
  if (charPoint >= 65 && charPoint <= 90)
  {
     //its ucase
  }
}