title: Interesting exercises using printf & scanf only
body: <p>I'm running out of ideas for my "Beginning C" class, and the only topics I've discussed so far are Data types, Variables &amp; the printf &amp; scanf functions.</p>
  
  <p>My last quizzes involved simple formulas (area of a circle, volume of a cube..) enclosed inside the printfs..</p>
  
  <p><code>
  eg. printf("volume = %d",length * width * height);
  </code></p>
  
  <p>I'm looking for something more interesting using only printfs and scanfs :(</p>
  
  <p>Update~ Just to clarify: My students don't know how to use conditional statements and iterative statements yet. It's only week 2, and this is their very first programming class :'( And yes, they can only retrieve the input, then modify it in some way before they output it in the console. I can play with escape sequences (create a box asterisks) or format specifiers (a 3 precision division operation) but that's it..</p>