title: Check if elements in an array are inside of another array
body: <p>So If I have these two arrays:</p>
  
  <p><code>int array1[] = {1, 2 ,3};</code></p>
  
  <p><code>int array2[] = {1, 2, 3, 4, 5};</code></p>
  
  <p>How do I check if <code>1, 2 and 3</code> from array1 are in array2?  `</p>
  
  <p>Thanks in advance.</p>