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Thread: Problem with adapting a C++ program to Java

  1. #1
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    Default Problem with adapting a C++ program to Java

    This program inputs temperature readings. Works easy in C++ but it's more difficult in Java. The current error I'm getting is the compiler is telling me "ch cannot be resolved to a variable." How can I fix this? The user enters 'y' telling the program he wants to enter another temperature reading, or else he enters 'n' which should break the loop and end the program and calculate the results.

    import java.util.Scanner;
     
    public class TemperatureReadings
    {
    	public static void main(String args[])
    	{
    		Scanner myScanner = new Scanner(System.in);
    		int count = 0;
    		double temperature = 0.0;
    		double average = 0.0;
     
    		do
    		{
    			System.out.print("Enter a temperature reading: ");
    			temperature = myScanner.nextDouble();
    			average += temperature;
    			count++;
     
    			System.out.print("Do you want to enter another? (y/n)");
    			char ch = myScanner.next().charAt(0); // right here compiler error
    		} while(ch == 'y');	
     
    		average /= count;
    		System.out.println("The average temperature reading is " + average);
    	}
    }

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Problem with adapting a C++ program to Java

    Your error location is on the wrong line. It should be on the while statement.
    The while statement requires that variables being tested be declared outside of the while loop.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Problem with adapting a C++ program to Java

    Thank You. I got it going now. All I need to do now is adjust the output so my program only shows one or two decimal places after the decimal point. I'll do some research.

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Problem with adapting a C++ program to Java

    adjust the output so my program only shows one or two decimal places after the decimal point.
    Look at the printf method and the Formatter class for how to write formatting text.
    If you don't understand my answer, don't ignore it, ask a question.

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