title: Simple programming practice (using modulus op)
body: <p>First question, I'm trying to do a practice where I am asked to return true if the given non-negative number is a multiple of 3 or 5, but not both. Examples are;</p>
  
  <p>old35(3) → true</p>
  
  <p>old35(10) → true</p>
  
  <p>old35(15) → false</p>
  
  <p><em>So 3 would be true, as it's a multiple of 3, but I can't currently make my code work for all instances. Code below;</em></p>
  
  <pre><code>public boolean old35(int n) {
       if ((35 % n == 3) || (35 % n == 5))
          return true;
       return false;
  }
  </code></pre>
  
  <p>How could I edit this to fit the criteria of what the practice is telling me to do?
  ></p>