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Thread: My 'if statements' are skipped after user input

  1. #1
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    Default My 'if statements' are skipped after user input

    The program shuts down right after I receive input for a String and an int variable, and I'm really confused as to why it's doing this. Any help at all would be greatly appreciated.

     
    import java.util.Scanner;
     
    class Tempurature{
        public static void main(String args[])
    	 {
    Scanner in = new Scanner(System.in);
     
            int tempNum;
            String tempScale;
     
            System.out.print("Type F for Fahrenheit or C for Celsius: ");
    	tempScale = in.nextLine();
            System.out.print("Enter the tempurature: ");
            tempNum = in.nextInt();
     
    if (tempScale == "C" && tempNum >= 100)
     
            System.out.println("Your water is boiling."); 
     
    if  (tempScale == "F" && tempNum >= 212)
     
            System.out.println("Your water is boiling.");
     
    if  (tempScale == "F" && tempNum >= 212)
            System.out.println("Your water is liquid.");
     
     
    else if (tempScale == "C"  && tempNum <= 100)
            System.out.println("Your water is liquid.");
     
        }
    }


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    Default Re: My 'if statements' are skipped after user input

    For String equality, use the equals method as opposed to ==. See the following post for more information:
    Common Java Mistakes

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    Default Re: My 'if statements' are skipped after user input

    Quote Originally Posted by copeg View Post
    For String equality, use the equals method as opposed to ==. See the following post for more information:
    Common Java Mistakes

    Well now I am getting errors around my "&&" in this line:
    if (tempScale = "C" && tempNum >= 100)
     
            System.out.println("Your water is boiling.");

    Do I need to convert "C" to a number? If so then could I get some help on that as well?

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    Default Re: My 'if statements' are skipped after user input

    Well now I am getting errors around my "&&" in this line:
    Post the error as I'm not very good at reading minds...and based upon the code snippet you just posted it doesn't seem like you took my previously posted advice.

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    Default Re: My 'if statements' are skipped after user input

    Quote Originally Posted by copeg View Post
    Post the error as I'm not very good at reading minds...and based upon the code snippet you just posted it doesn't seem like you took my previously posted advice.
    Sorry about that. The error I get is "not a statement" on the && part. I'm not particularly sure what I need to do to fix it.

     
    if ((tempScale) equals("C") && (tempNum >= 100));

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    Default Re: My 'if statements' are skipped after user input

    cozliz, in the previously linked answer, it seems that you saw the equals, but not the format to use the method.

    for example:
          if(p1.equals(p2))
            {
                System.out.println("p1 and p2 have the same value");
            }
    Last edited by Herah; October 8th, 2011 at 07:56 PM.

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    Default Re: My 'if statements' are skipped after user input

    Quote Originally Posted by Cozilz View Post
    Sorry about that. The error I get is "not a statement" on the && part. I'm not particularly sure what I need to do to fix it.

     
    if ((tempScale) equals("C") && (tempNum >= 100));
    You have a syntax error within this if statement. Your logic is correct though.
    Simplicity calls for Complexity. Think about it.

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