title: Unable to find numeric literal operator ‘operator""
body: <p>I'm trying to create an array with inside: <code>1_0R 1_5R 2_0R</code></p>
  
  <pre><code>char height[] = { 1_0R , 1_5R , 2_0R };
  </code></pre>
  
  <p>because I'm working with i/o files, and the string mentioned are inside the filenames. I use</p>
  
  <pre><code>+to_string( height[1] )+
  </code></pre>
  
  <p>When I compile I get the 3 errors</p>
  
  <pre><code> **error: unable to find numeric literal operator ‘operator""_0R’**
   **error: unable to find numeric literal operator ‘operator""_5R’**
   **error: unable to find numeric literal operator ‘operator""_0R’**
  </code></pre>
  
  <p>What can I do?</p>