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   atoi

   Usage
   #include <stdlib.h>
   int atoi(const char *nptr);

   Description
   This  converts  the  string pointed to by nptr into  an  integer.  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("atoi function = %d\n",atoi("153"));
   }

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