atof(3p) [suse man page]

ATOF(3P)						     POSIX Programmer's Manual							  ATOF(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       atof - convert a string to a double-precision number

SYNOPSIS

       #include <stdlib.h>

       double atof(const char *str);

DESCRIPTION

       The call atof(str) shall be equivalent to:

	      strtod(str,(char **)NULL),

       except that the handling of errors may differ. If the value cannot be represented, the behavior is undefined.

RETURN VALUE

       The atof() function shall return the converted value if the value can be represented.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

       None.

APPLICATION USAGE

       The atof() function is subsumed by strtod() but is retained because it is used extensively in existing code. If the number is not known	to
       be in range, strtod() should be used because atof() is not required to perform any error checking.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       strtod(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical  and	Electronics  Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE
       and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can  be  obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								  ATOF(3P)

ATOI(3P)						     POSIX Programmer's Manual							  ATOI(3P)

PROLOG

       This  manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (consult the correspond-
       ing Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.

NAME

       atoi - convert a string to an integer

SYNOPSIS

       #include <stdlib.h>

       int atoi(const char *str);

DESCRIPTION

       The call atoi(str) shall be equivalent to:

	      (int) strtol(str, (char **)NULL, 10)

       except that the handling of errors may differ. If the value cannot be represented, the behavior is undefined.

RETURN VALUE

       The atoi() function shall return the converted value if the value can be represented.

ERRORS

       No errors are defined.

       The following sections are informative.

EXAMPLES

   Converting an Argument
       The following example checks for proper usage of the program. If there is an argument and the decimal conversion of this argument (obtained
       using atoi()) is greater than 0, then the program has a valid number of minutes to wait for an event.

	      #include <stdlib.h>
	      #include <stdio.h>
	      ...
	      int minutes_to_event;
	      ...
	      if (argc < 2 || ((minutes_to_event = atoi (argv[1]))) <= 0) {
		 fprintf(stderr, "Usage: %s minutes
", argv[0]); exit(1);
	      }
	      ...

APPLICATION USAGE

       The  atoi() function is subsumed by strtol() but is retained because it is used extensively in existing code. If the number is not known to
       be in range, strtol() should be used because atoi() is not required to perform any error checking.

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       strtol(), the Base Definitions volume of IEEE Std 1003.1-2001, <stdlib.h>

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and  the  original  IEEE
       and  The  Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
       online at http://www.opengroup.org/unix/online.html .

IEEE
/The Open Group						       2003								  ATOI(3P)