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Thread: Java student - confusing quiz questions

  1. #1
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    Default Java student - confusing quiz questions

    Hello Java World! I am hoping that someone can clear up some questions for me. I recently took a quiz and I don't understand why a few of my answers were counted wrong. In the following problem:

    Complete this coding to print exactly 3 numbers on every line:
    for (int k = 5;  k < 65;  k++)
     if ( ________________ == 1)     
      System.out.println ("  " + k);
     else    
      System.out.print ("   " + k);

    Why is the answer k%3?

    In the following problem:

    if (x == 5 || y > 2) is fully equivalent to if ( ! ( ________________ ) )

    Why is the answer x != 5 && y <= 2

    In the following problem:

    Complete this if-statement (you may use else) to assign to x the smaller of y and z:

    if (y < z) ________________ ;

    Why is the answer x = y; else x = z

    Also, can you put the else statement and the other on the same line?

    I'm sorry if these questions seem basic but I am just starting out and I want to make sure I understand completely before moving on. Thank you so much for taking the time to help!


  2. #2
    Member andbin's Avatar
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    Default Re: Java student - confusing quiz questions

    Quote Originally Posted by Techstudent View Post
    Complete this coding to print exactly 3 numbers on every line:
    for (int k = 5;  k < 65;  k++)
     if ( ________________ == 1)     
      System.out.println ("  " + k);
     else    
      System.out.print ("   " + k);

    Why is the answer k%3?
    Do you know what is the % operator?

    Quote Originally Posted by Techstudent View Post
    In the following problem:

    if (x == 5 || y > 2) is fully equivalent to if ( ! ( ________________ ) )

    Why is the answer x != 5 && y <= 2
    Do you know De Morgan's laws? (hint: search on Wikipedia)
    This is inherent to boolean algebra.

    Quote Originally Posted by Techstudent View Post
    In the following problem:

    Complete this if-statement (you may use else) to assign to x the smaller of y and z:

    if (y < z) ________________ ;

    Why is the answer x = y; else x = z
    If y is lower than z, what is the smaller? And otherwise?
    Andrea, www.andbin.net SCJP 5 (91%) SCWCD 5 (94%)

    Useful links for Java beginners My new project Java Examples on Google Code

  3. The Following User Says Thank You to andbin For This Useful Post:

    GregBrannon (January 14th, 2014)

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