{{keywords>wiki library source code example reference}}
===== isalpha =====
<code c>
    int isalpha(int chr);
</code>
check if a character Alphabetical

===== C Sourcecode Example =====
<code c>
#include <stdio.h> /* including standard library */
//#include <windows.h> /* uncomment this for Windows */

#include <ctype.h>

int main ()
{
  int i;
  char string[11]="Test -!&%1";
  for (i=0; i <= 11;i++)
    {
     if ( isalpha(string[i]) != 0 )
      {
       printf("Character %i is alphabetical\n",i);
      }
    }
  return 0;
}
</code>
==== output ====
    user@host:~$ ./isalpha 
    Character 0 is alphabetical
    Character 1 is alphabetical
    Character 2 is alphabetical
    Character 3 is alphabetical