atoi Post: 101531

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1. Programming

help with atoi and macros in C

I have a PORT_NUM macro (10 digits long number) in a server file, if i do htons(PORT_NUM) i get warning: this decimal constant is unsigned only in ISO C90 warning: large integer implicitly truncated to unsigned type whats wrong with this?

2. Programming

type conversion C, atoi()

In the book "The C programming language"; second edition, chapter 2.7 there is a snippet which is supposed to: "convert a string of digits into its numeric equivalent". int atoi(char s) { int i, n; n = 0; for ( i = 0; s >= '0' && s <= '9'; ++i) n = 10 * n + (s -...

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atof_l

ATOF(3) 						   BSD Library Functions Manual 						   ATOF(3)

NAME

     atof, atof_l -- convert ASCII string to double

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdlib.h>

     double
     atof(const char *str);

     #include <xlocale.h>

     double
     atof_l(const char *str, locale_t loc);

DESCRIPTION

     The atof() function converts the initial portion of the string pointed to by str to double representation.

     It is equivalent to:

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

     The decimal point character is defined in the program's locale (category LC_NUMERIC).

     While the atof() function uses the current locale, the atof_l() function may be passed a locale directly. See xlocale(3) for more informa-
     tion.

IMPLEMENTATION NOTES

     The atof() function is not thread-safe and also not async-cancel-safe.

     The atof() function has been deprecated by strtod() and should not be used in new code.

ERRORS

     The function atof() need not affect the value of errno on an error.

SEE ALSO

     atoi(3), atol(3), strtod(3), strtol(3), strtoul(3), xlocale(3)

STANDARDS

     The atof() function conforms to ISO/IEC 9945-1:1990 (``POSIX.1''), ISO/IEC 9899:1990 (``ISO C90''), and ISO/IEC 9899:1999 (``ISO C99'').

BSD
								   June 4, 1993 							       BSD