output problems

[straggler]

I created a program to read in a file, transform the given roman numeral, double the numeral, and then output the new roman numeral.

I am not even sure yet if my Roman decrpyt and encrpytion is right because nothing is outputting into the roman.out file??

public class Roman {
	
		public void decryptEncrypt (String inputFileName, String outputFileName)
		{
			try {
				FileReader reader = new FileReader(inputFileName) ;
				Scanner in = new Scanner(reader) ;
				PrintWriter out = new PrintWriter(outputFileName) ;
				

				String romanout = " ";
				while (in.hasNext( ) ){
					String roman = in.nextLine( ) ;
					//out.print(roman);
					for(int i = 0; i < roman.length(); i++) {
						int num = 0;
						char digit = ' ';
						digit = roman.charAt(i);
						while(digit != -1){
							if(digit == 'I'){
								num++;
								if(digit == 'V'){
									num = num + 3;
								}
								else if(digit == 'X'){
									num = num + 8;
								}
							}
							if(digit == 'V'){
								num = num + 5;
							}
							if(digit == 'X'){
								num = num + 10;
								if(digit == 'L'){
									num = num + 30;
								}
								else if(digit == 'C'){
									num = num + 80;
								}
							}
							if(digit == 'L'){
								num = num + 50;
							}
							if(digit == 'C'){
								num = num + 100;
							}
							
						}
						
			System.out.println(num);	
							num = num * 2;
			//System.out.println(num);
			
					while(num > 0){
							if(num > 100){
								num = num - 100;
								romanout = romanout + "C";
							}
							if(num == 90){
								num = num - 90;
								romanout = romanout + "XC";
							}
							if(num > 50){
								num = num - 50;
								romanout = romanout + "L";
							}
							if(num == 40){
								num = num - 40;
								romanout = romanout + "XL";
							}
							if(num > 10){
								num = num - 10;
								romanout = romanout + "X";
							}
							if(num == 9){
								num = num - 9;
								romanout = romanout + "IX";
							}
							if(num > 5){
								num = num - 5;
								romanout = romanout + "V";
							}
							if(num == 4){
								num = num - 4;
								romanout = romanout + "IV";
							}
							if(num > 1){
								num = num - 1;
								romanout = romanout + "I";
							}
					}
					out.print(roman);
					out.print(romanout);
					}
					
				}
				in.close( ) ;
				out.close( ) ;	
				}
			catch(IOException e)
			{
				System.out.println(e) ;
			}
		}
		
		public static void main(String [] args){	
			Roman reader = new Roman( ) ;
			reader.decryptEncrypt("roman.in", "roman.out") ;	
		}
}

[JosAH]

In the body of your while loop (starting at line #19) you never re-assign a value to variable digit so if it wasn't equal to -1 to start with that loop never terminates.

kind regards,

Jos