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Thread: cannot enter a floating point number

  1. #1
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    Default cannot enter a floating point number

    hello,

    I have a little assignment where I have to create a primitive currency converter from CAD to NR. Below is the code I have so far:

    import java.util.Random;
    public class BigDecisions
    {
        static public void main( String[] args)
        {
           System.out.println("Please enter the exchange rate: \n");
     
           ConsoleReader console = new ConsoleReader(System.in);
           float rate = console.readInt();
           System.out.println("\nThe rate you entered was: " + rate);
     
           System.out.println("\nPress '0' to convert to NR, Press 1 to convert to CAD: ");
           ConsoleReader console2 = new ConsoleReader(System.in);
           float num = console2.readInt();
     
           System.out.println("Please enter the amount to be converted: ");
           ConsoleReader console3 = new ConsoleReader(System.in);
           float num2 = console3.readInt();
     
           if ( num == 1 )
           System.out.println(num2 + " Indian Rupies converts to " + rate * num2 + " Canadian Dollars");
           else if ( num == 0 )
           System.out.println(num2 + " Canadian Dollars converts to " + (1-rate) * num2 + " Indian Rupies");
     
        }
    }

    Even though my math calculations are incorrect, I can get it to work if I use whole numbers. My problem is that I need to use decimal points.

    The error message I recieve refers to the ConsoleReader class I used which is written below:

    import java.io.InputStreamReader;
    import java.io.InputStream;
    import java.io.BufferedReader;
    import java.io.IOException;
     
    public class ConsoleReader {
    	private BufferedReader reader;
     
    	public ConsoleReader(InputStream inStream) {
    		reader = new BufferedReader(new InputStreamReader(inStream));
    	}
     
    	public String readLine() {
    		String inputLine = "";
    		try {
    			inputLine = reader.readLine();
    		} catch (IOException e) {
    			System.out.println(e);
    			System.exit(1);
    		}
    		return inputLine;
    	}
    	public int readInt() {
    		String inputString = readLine();
    		int n = Integer.parseInt(inputString);
    		return n;
    	}
     
    	public double readDouble() {
    		String inputString = readLine();
    		double x = Double.parseDouble(inputString);
    		return x;
    	}
    }

    The error I get refers to the line "int n = Integer.parseInt(inputString);
    The error I recieve is "java.lang.NumberFormatException: For input string: "1.1"

    Any idea on how I can get decimals to work with this program? any help is much appreciated.


  2. #2
    Super Moderator pbrockway2's Avatar
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    Default Re: cannot enter a floating point number

    If you're expecting a floating point numeral use readDouble(), not readInt(). The latter method will throw a runtime exception if the string it is reading includes a decimal point.

  3. The Following User Says Thank You to pbrockway2 For This Useful Post:

    Tedstriker (July 5th, 2013)

  4. #3
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    Default Re: cannot enter a floating point number

    Worked like a charm, thanks alot.

  5. #4
    Super Moderator pbrockway2's Avatar
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    Default Re: cannot enter a floating point number

    You're welcome.

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