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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atoll

ATOL(3) 						   BSD Library Functions Manual 						   ATOL(3)

NAME

     atol, atoll, atol_l, atoll_l -- convert ASCII string to long or long long integer

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdlib.h>

     long
     atol(const char *str);

     long long
     atoll(const char *str);

     #include <xlocale.h>

     long
     atol_l(const char *str, locale_t loc);

     long long
     atoll_l(const char *str, locale_t loc);

DESCRIPTION

     The atol() function converts the initial portion of the string pointed to by str to long integer representation.

     It is equivalent to:

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

     The atoll() function converts the initial portion of the string pointed to by str to long long integer representation.

     It is equivalent to:

	   strtoll(str, (char **)NULL, 10);

     While the atol() and atoll() functions use the current locale, the atol_l() and atoll_l() functions may be passed locales directly. See
     xlocale(3) for more information.

ERRORS

     The functions atol() and atoll() need not affect the value of errno on an error.

SEE ALSO

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

STANDARDS

     The atol() function conforms to ISO/IEC 9899:1990 (``ISO C90'').  The atoll() function conforms to ISO/IEC 9899:1999 (``ISO C99'').

BSD
								 November 28, 2001							       BSD