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Thread: java problem

  1. #1
    Zunon is offline Member
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    Unhappy java problem

    SOLVED REQUESTING LOCK


    hi, im zunon im 13 yrs old and im learning java, while reading the book :
    Java: a beginners guide fifth edition i stumbled upon the same error twice:
    when I copy the code shown in the book and try to compile them I get an error in javac but when I copy and paste the exact same code from the file from the website it compiles and runs perfectly, I tried to spot and eliminate every difference I find in the 2 texts can you help me and find the differences I couldn't find?

    My version of the code:

    Java Code:
    /*
       This program illustrates the differences
       between int and double.
      
       Call this file Example3.java
    */
    class Example3 {
      public static void main(String args[]) {
        int var;  // this declares an int variable
    	double x; // this declares a floating-point variable
    	
    	var = 10; // assign var the value 10
    	
    	x = 10.0; // assign x the value 10.0
    	
    	System.out.printIn("Original value of var: " + var);
    	System.out.printIn("Original value of x: " + x);
    	
    	System.out.printIn(); // print a blank line
    	
    	// now, divide both by 4
    	var = var / 4;
    	x = x / 4;
    	
    	System.out.printIn("var after division: " + var);
    	System.out.printIn("x after division: " + x);
      }
    }
    the supplied one from the book:
    Java Code:
    /*  
       This program illustrates the differences 
       between int and double. 
     
       Call this file Example3.java. 
    */  
    class Example3 {  
      public static void main(String args[]) {  
        int var;  // this declares an int variable 
        double x; // this declares a floating-point variable 
     
        var = 10; // assign var the value 10 
        
        x = 10.0; // assign x the value 10.0 
     
        System.out.println("Original value of var: " + var); 
        System.out.println("Original value of x: " + x); 
     
        System.out.println(); // print a blank line 
     
        // now, divide both by 4 
        var = var / 4;  
        x = x / 4; 
     
        System.out.println("var after division: " + var); 
        System.out.println("x after division: " + x); 
      }  
    }
    Last edited by Zunon; 07-19-2012 at 11:13 AM. Reason: add code tags

  2. #2
    JosAH's Avatar
    JosAH is offline Moderator
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    Default Re: java problem

    What did your compiler complain about? (copy the error message verbatim here please).

    kind regards,

    Jos
    The only person who got everything done by Friday was Robinson Crusoe.

  3. #3
    Zunon is offline Member
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    Default Re: java problem

    Example3.java:16: error: cannot find symbol
    System.out.printIn("Original value of var: " + var);
    ^
    symbol: method printIn(String)
    location: variable out of type PrintStream
    Example3.java:17: error: cannot find symbol
    System.out.printIn("Original value of x: " + x);
    ^
    symbol: method printIn(String)
    location: variable out of type PrintStream
    Example3.java:19: error: cannot find symbol
    System.out.printIn(); // print a blank line
    ^
    symbol: method printIn()
    location: variable out of type PrintStream
    Example3.java:25: error: cannot find symbol
    System.out.printIn("var after division: " + var);
    ^
    symbol: method printIn(String)
    location: variable out of type PrintStream
    Example3.java:26: error: cannot find symbol
    System.out.printIn("x after division: " + x);
    ^
    symbol: method printIn(String)
    location: variable out of type PrintStream
    5 errors

  4. #4
    Tolls is offline Moderator
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    Default Re: java problem

    And please use [code] tags [/code] when posting code.
    Please do not ask for code as refusal often offends.

    ** This space for rent **

  5. #5
    Tolls is offline Moderator
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    Default Re: java problem

    That's a lower case 'L' in println, not an 'I'.
    Please do not ask for code as refusal often offends.

    ** This space for rent **

  6. #6
    Zunon is offline Member
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    Default Re: java problem

    no I'm pretty sure that's an I using np++ I can see the difference between I and l

  7. #7
    JosAH's Avatar
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    Default Re: java problem

    Turn on the light above your computer screen and check again.

    kind regards,

    Jos
    The only person who got everything done by Friday was Robinson Crusoe.

  8. #8
    Zunon is offline Member
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    Default Re: java problem

    Quote Originally Posted by JosAH View Post
    Turn on the light above your computer screen and check again.

    kind regards,

    Jos
    it's already clear, it's midday and I triple-checked and I'm pretty sure that's an 'I'
    thank you - Zunon

  9. #9
    JosAH's Avatar
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    Default Re: java problem

    Quote Originally Posted by Zunon View Post
    it's already clear, it's midday and I triple-checked and I'm pretty sure that's an 'I'
    thank you - Zunon
    Just for the fun of it, change the capital 'I' to a lower case 'l' and see for yourself.

    kind regards,

    Jos
    The only person who got everything done by Friday was Robinson Crusoe.

  10. #10
    Zunon is offline Member
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    Wink Re: java problem

    Quote Originally Posted by JosAH View Post
    Just for the fun of it, change the capital 'I' to a lower case 'l' and see for yourself.

    kind regards,

    Jos
    OH ... I thought it should be with an I not an L, I didn't know that ... Sorry for arguing, I'm too stupid to have seen that.


    Thank you alot for showing me

  11. #11
    Zunon is offline Member
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    Default Re: java problem

    I just downloaded Eclipse and I see that PrintIn is wrong but Println in right... but what does the Ln part mean? Requesting lock for thread

  12. #12
    Tolls is offline Moderator
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    Default Re: java problem

    It's shorthand for "line".
    So "print line".

    Don't ask me why they shortened it, but I suspect it's a C++ stdlib throwback.
    Please do not ask for code as refusal often offends.

    ** This space for rent **

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