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  1. #1
    eck0 is offline Member
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    Default Unresolved Compilation Problems

    Hello World!


    I'm new to the Java programming language and I have never been the best when it comes to programming. Im preparing to study Java semester 2 this year, so I have managed to get my hands on an old assignment.


    The program that I am trying to create is the program will record 12 temperatures which the user will input (using ConsoleReader).

    The Program will record each input for each month, then print a line with all the numbers stored in the array. It will then work out, lowest, highest and average temperature. The last task that the program will run, is a count of number of months that fall between a certain temperature range.


    So here's the program:


    Java Code:
    //Assignment 3
    // Winston Ho
    // S3274617
    
    import java.io.*;
    
    public class TempCalc {
    	/**
    	 * @param args
    	 */
    	ConsoleReader console = new ConsoleReader();
    	public static void main(String[] args) 
    	{
    
    		// recording input from user into array, using while conditions to test if values are within -10 and 40 range
    		
    		System.out.println( "Welcome to TempCalc" );	
    		
    		System.out.println("Reading Temperature Values for 12 Months");
    		int[] tempnum = new int[12];
    
    		int index;
    				for(index = 0 ; index < 12 ; index = index + 1)
    			{
    			System.out.println("Please enter the value For Month " + index  );
    			tempnum[index] = console.readInt();
    			boolean flag = false;
    			while (flag == false) {
    				if (tempnum[index] > 40 || tempnum[index] <= -10) 
    				{
    					System.out.println ("The value must be within -10 and 40. Try again:");
    					tempnum[index] = console.readInt();
    					index--;
    				}
    				else {
    					tempnum[index] = tempnum[index];
    					flag = true;
    				}
    			}
    		}
    
    
    
    		// working maximum temperature
    		int highest;
    	
    
    		highest = tempnum[0];
    
    		for (index = 0; index < 12; index = index + 1)
    			{
    				if (tempnum[1] > highest)
    					{
    						highest = tempnum[index];
    					}
    			}
    		System.out.println ("The highest value was:" + highest);
    
    
    
    
    		// working minimum temperature
    
    		int lowest;
    		
    		
    		lowest = tempnum[0];
    
    		for (index = 0; index < 12; index = index + 1)
    			{
    				if (tempnum[1] < lowest )
    					{
    						lowest = tempnum[index];
    					}
    			}
    		System.out.println ("The lowest value was:" + lowest);
    
    
    
    
    
    
    
    		// average temperature
    		
    		int avgtemp;
    		avgtemp = 0;
    
    		for (index = 0; index < 12; index = index + 1)
    			{ 
    				avgtemp = avgtemp + tempnum[index];
    			}
    		System.out.println ("Average temp is:" + avgtemp );
    
    
    
    
    
    
    		// printing number of values between -10 and -1
    		int countone;
    		for (index = 0; index <12 ; index = index + 1)
    			{
    				if (tempnum[index] >= -10 || tempnum[index]<= -1)
    					{
    						countone = countone + 1;
    					}
    			}
    		System.out.println (" The number of months with values between -10 and -1 was:" + countone);
    
    
    
    
    
    
    
    		// printing number of values between  0 and 9
    		int counttwo = 0;
    		for (index = 0; index <12 ; index = index + 1);
    			{
    				if (tempnum[index] >= 0 || tempnum[index]<= 9)
    					{
    						counttwo = counttwo + 1;
    					}
    			}
    		System.out.println (" The number of months with values between 0 and 9 was:" + counttwo);
    
    
    
    
    
    
    		// printing number of values between  10 and 19
    		int countthree = 0;
    		for (index = 0; index <12 ; index = index + 1)
    			{
    				if (tempnum[index] >= 10 || tempnum[index]<= 19)
    					{
    						countthree = countthree + 1;
    					}
    			}
    		System.out.println (" The number of months with values between 10 and 19 was:" + countthree);
    
    
    
    
    
    		// printing number of values between 20 and 29
    		int countfour = 0;
    		for (index = 0; index <12 ; index = index + 1)
    			{
    				if (tempnum[index] >= 20 || tempnum[index]<= 29)
    					{
    						countfour = countfour + 1;
    					}
    			}
    		System.out.println (" The number of months with values between 20 and 29 was:" + countfour);
    
    
    
    		// printing number of values between  and 0
    		int countfive = 0;
    		for (index = 0; index <12 ; index = index + 1)
    			{
    				if (tempnum[index] >= 30 || tempnum[index]<= 40)
    					{
    						countfive = countfive + 1;
    					}
    			}
    					
    		System.out.println ( "The number of months with values between 30 and 40 was:" + countfive);
    		
    
    
    
    		System.out.println ("Thank you for using TempCalc"); }
    }

    The ConsoleReader

    Java Code:
    import java.io.*;
    public class ConsoleReader {
    	public ConsoleReader()
    	{
    		reader = new BufferedReader(new InputStreamReader(System.in));
    	}
    	
    	private BufferedReader reader;
    	
    	public int readInt()
    	{
    		String inputString = readLine();
          		int n = Integer.parseInt(inputString);
    		return n;
    	}
    	
    	public String readLine()
    	{
    		String inputLine = "";
    		try
    		{
    			inputLine = reader.readLine();
    		
    		} catch (IOException e)
    		{
    			System.out.println(e);
    			System.exit(1);
    		}
    		return inputLine;
    	}
    }

    Now the issue I am having is that when I try and run the program, it throws an error stating:

    Exception in thread "main" java.lang.Error: Unresolved compilation problems:
    The local variable countone may not have been initialized
    The local variable countone may not have been initialized

    at TempCalc.main(TempCalc.java:102)



    Im puzzled at what I have done wrong, can anyone point me in the right direction?

  2. #2
    Toll's Avatar
    Toll is offline Senior Member
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    Default

    Java Code:
    		int countone;
    		for (index = 0; index <12 ; index = index + 1)
    			{
    				if (tempnum[index] >= -10 || tempnum[index]<= -1)
    					{
    						countone = countone + 1;
    					}
    			}
    You don't set a start value for countone.

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