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   atol

   Usage
   #include <stdlib.h>
   long atol(const char *nptr);

   Description
   Converts  the  string pointed to by nptr into a long. The  string  may
   have  leading spaces, tabs, and + or -. Conversion stops on the  first
   unrecognized  character.  If there are no recognized  characters,  the
   result is 0.

   Example
   #include <stdio.h>
   #include <stdlib.h>
   main()
   {
        printf("atol function = %ld\n",atol("1234 String"));
   }

   Return Value
   Returns  the  long value derived from converting the string.  Zero  is
   returned   if  the  input  string  does  not  have  any   recognizable
   characters.