title: How to turn *argv[] into a string inside isaplha
body: <p>New to programming C++ and am having an issue with using isaplha to recongnize and display an error message when an argument is a letter. A, A1, and any combination of alpha-numerals starting with a letter displays an error, how ever 1a will pass as containing no letters. My code is as follows.    </p>
  
  <pre><code>for(int s = 1; s&lt; argc; s++)
  {
      if (isalpha(*argv[s]))
      {
          cout &lt;&lt; "You have entered a letter, however letters are not valid arguments";
      }
      else etc... etc...
  </code></pre>
  
  <p>Any help would be appreciated!  </p>