Another story on random == unique wtf



  • This gem existed some years ago in our codebase.

    The problem that the ingenious programmer tried to solve? Create a handful of artificial namespace prefixes for use in some generated xml output.

    private String createname(){
    	char chars []= {'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
    
    	String str = String.valueOf(chars);
    	String name = "";
    
    	for(int i=0; i<3; i++){
    		name = name + str.charAt((int)((Math.random()*26)%26));
    	}
    	return (name);
    }
    

    I once saw a prefix named "bug". "Curious", I thought, and ignored it.

    The second time it caught my attention was when it exploded.

    The moral: always pay attention to what your code tries to tell you.



  • I think you should just change that 3 to 4 and wait for the really interesting words to show up. 



  • Yeah, but why restrain myself to that? I could just change it to 1,145,589 and wait till the Iliad comes out. Epic poetry embedded in XML? Customers would love it!



  • butitcouldusesomespacetheretooandperhapssomepunctuation



  • @DOA said:

    I think you should just change that 3 to 4 and wait for the really interesting words to show up. 

     

     Words like 'aaaa'? Because the only thing this function will ever generate is a stream of 'a'.

    The random value is first multiplied by 26, making it a multiple of 26. Then it is modded by 26, which will always be zero.

     



  • @smxlong said:

    @DOA said:

    I think you should just change that 3 to 4 and wait for the really interesting words to show up. 

     

     Words like 'aaaa'? Because the only thing this function will ever generate is a stream of 'a'.

    The random value is first multiplied by 26, making it a multiple of 26. Then it is modded by 26, which will always be zero.

     

    http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Math.html



    public static double random()


    Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0.



  • @julmu said:

    @smxlong said:

    @DOA said:

    I think you should just change that 3 to 4 and wait for the really interesting words to show up. 

     

     Words like 'aaaa'? Because the only thing this function will ever generate is a stream of 'a'.

    The random value is first multiplied by 26, making it a multiple of 26. Then it is modded by 26, which will always be zero.

     

    http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Math.html



    public static double random()


    Returns a double value with a positive sign, greater than or equal to 0.0 and less than 1.0.


    I nominate you, sir, for the most brillant person of the thread. Congrats!



  • @ounos said:

    I nominate you, sir, for the most brillant person of the thread. Congrats!

    I don't get it. Why do you think that I'm brillant?



  • Your browser settings must be hiding the <irony> tags all around. But you can't see that.


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