Help with a Java program - Overclock.net

*dangerousHobo* · 09-05-06

OK well I'm writing this program for school. Its one that a user enters a class name then enters the grades, then finds the total for each letter grade then the total grades entered , and then does all that again and compares the two grade histograms to see if they are equal.

The Prof. already gave us the javadoc for the class. My first problem is in one of the methods, trying to convert a instance variable of type char to uppercase, but the string class method .toUpperCase does not work(since its type char). So is there another way to do this? Like with type casting or the Wrapper classes?

Thanks for any help.

mjoc13 · 09-05-06

Quote:

Originally Posted by dangerousHobo

OK well I'm writing this program for school. Its one that a user enters a class name then enters the grades, then finds the total for each letter grade then the total grades entered , and then does all that again and compares the two grade histograms to see if they are equal.

The Prof. already gave us the javadoc for the class. My first problem is in one of the methods, trying to convert a instance variable of type char to uppercase, but the string class method .toUpperCase does not work(since its type char). So is there another way to do this? Like with type casting or the Wrapper classes?

Thanks for any help.

Well it's not the prettiest coding but if you are determined to use the toUpperCase() then you can write something like this.

public char convert(char lowerChar) {
String temp = "" + lowerChar;
temp = temp.toUpperCase();

return temp.charAt(0);
}

OR

public char convert(char lowerChar) {
lowerChar -= 32;
return lowerChar;
}

Since the difference b/w ascii 'a' and ascii 'A' is 32.

hope it helps.

*dangerousHobo* · 09-05-06

Quote:

Originally Posted by mjoc13

Well it's not the prettiest coding but if you are determined to use the toUpperCase() then you can write something like this.

public char convert(char lowerChar) {
String temp = "" + lowerChar;
temp = temp.toUpperCase();

return temp.charAt(0);
}

OR

public char convert(char lowerChar) {
lowerChar -= 32;
return lowerChar;
}

Since the difference b/w ascii 'a' and ascii 'A' is 32.

hope it helps.

Thanks mate. I think I'm just going to do an OR statement in the if question to cover both 'a' and 'A'.
Thank you for the help though. I just want to keep the instance variable as type char and not mess with a temporary string for it.

rabidgnome229 · 09-05-06

if you want it in one line
yourchar = (((new String(yourchar)).toUpperCase()).toCharArray())[0];

or

yourchar = ((new String(yourchar)).toUppercase()).charAt(0);

mjoc13 · 09-05-06

char grade = 'a';
... work...
grade -= 32; //convert to upperCase

If you know your always dealing with lowercase then just subtract 32 from the char and the ascii will be upercase. No nested if's or type casting needed.

rabidgnome229 · 09-05-06

that only works if you know you have a lowercase letter. if you start with uppercase that method will mess the data up

*dangerousHobo* · 09-05-06

its a mixer of upper and lower case letters. I just wanted them all in uppercase to simplify the if statement.

*dangerousHobo* · 09-05-06

well I've ran into yet another problem. Seems like over the summer I've really forgotten some stuff.

Problem is I've got an infinite loop.

Code:

public String toString()
	{
		String temp = "A ";
		int star = 0, largest = 0;
		for(int i=0; i<gradeArray.length; i++)
			if(largest < gradeArray[i])
				largest = gradeArray[i];
		
		for(int s=0; s < gradeArray.length; s++)
		{
			while(star != this.gradeArray[s])
			{
				temp = temp + "*";
				star++;
			}
			while(star < largest)
				temp = temp + " ";
			temp =temp + " " + gradeArray[s] + "\n";
			
			if(s == 0)
				temp = temp + "B ";
			else if(s == 1)
				temp = temp + "C ";
			else if (s == 2)
				temp = temp + "D ";
			else if(s == 3)
				temp = temp + "F ";
			
			star = 0;
		}
		
		temp = temp + "\n" + getTotalGrades();
		return temp;
	}

public int getTotalGrades()
	{
		int total=0;
		for(int i=0;i < gradeArray.length; i++)
			total = total + gradeArray[i];
		return total;
	}

gradeArray[] has 5 locations. One for each letter grade.
The first method is just to print out the results like so: (say gradeArray[0] = 2 & gradeArray[1] = 1)

A ** 2
B * 1
etc.
can anyone spot the problem?
Thanks

rabidgnome229 · 09-05-06

Code:

while(star < largest)
		temp = temp + " ";

star never gets incremented, so it is always less than largest

*dangerousHobo* · 09-05-06

Quote:

Originally Posted by rabidgnome229

Code:

while(star < largest)
		temp = temp + " ";

star never gets incremented, so it is always less than largest

I cannot believe I overlooked that

Thank you have much rabidgnome.

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Help with a Java program

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