Convert roman numerals to integers

[Felissa]

Hello, The project is converting roman numerals to integers and integers to roman numerals.
I can get it to work if I ask the user to choose from an option menu..what I would like to do is just have the code read through and check to see if a string or an integer was entered in the input line....I tried both the while loop and the if statement...

public static int value(char letter) // used for switch case for conversion


given = input.readline();
ei: if(given == value) and if (given == num) do this....I keep getting values

cannot be resolved.
Thanks.

Felissa

[Marcus]

You can check if a String is an int by doing something like:

 String myString = "12345";
 int value;
 
 try
 {
     value = Integer.parseInt( myString );
 }
 catch( NumberFormatException nfe )
 {
     System.out.println( "please enter a valid number" );
 }

Of course, your logic might be different but if the system can't parse the string into an Integer it will throw the NumberFormatException.

Greetins.

Marcus

[Felissa]

Thanks for your help, that error is gone for now. I have two more errors.

expected "{", ;

this error is coming from this line

private int charToNumber(char letter) //which leads to switch (letter)

And misplaced construct and expected "{", ;

public int toInt()
{
return num;}

I found a website that explains errors, but what it suggested didn't work.


thanks for helping me!

Felissa