Thread: 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.

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.

Worked like a charm, thanks alot.

You're welcome.