atoi Post: 101539

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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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strtol(3C)																strtol(3C)

NAME

       strtol(), atol(), atoll(), atoi(), strtoul(), strtoll(), strtoull() - convert string to integer

SYNOPSIS

DESCRIPTION

       or  converts the character string pointed to by str to or representation, respectively.	or converts the character string pointed to by str
       to or representation, respectively.  The string is scanned up to the first character inconsistent with  the  base.   Leading  "white-space"
       characters (as defined by in ctype(3C)) are ignored.  If no conversion can take place, zero is returned.

       If base is greater than or equal to 2 and less than or equal to 36, it is used as the base for conversion.  After an optional leading sign,
       leading zeros are ignored, and or is ignored if base is 16.

       If base is zero, the string itself determines the base as follows: after an optional leading sign, a leading zero indicates  octal  conver-
       sion; a leading or indicates hexadecimal conversion.  Otherwise, decimal conversion is used.

       If  the	value  of ptr is not a pointer to the character terminating the scan is returned in the location pointed to by ptr.  If no integer
       can be formed, the location pointed to by ptr is set to str, and zero is returned.

       is equivalent to

       is equivalent to

       is equivalent to

RETURN VALUE

       Upon successful completion, all functions return the converted value, if any.

       If the correct value would cause overflow:

       returns	      or (according to the sign of the value), and sets to

       returns	      and sets to

       returns	      or (according to the sign of the value), and sets to

       returns	      and sets to

       returns	      or (according to the sign of the value), and sets to

       For all other errors, zero is returned and is set to indicate the error.

ERRORS

       and fail and is set, if any of the following conditions are encountered:

	      The value of   base is not supported.

	      The value to be returned would have caused overflow.

AUTHOR

       These interfaces were developed by OSF and HP.

SEE ALSO

       ctype(3C), strtod(3C), strtoimax(3C), scanf(3S), thread_safety(5), glossary(9).

STANDARDS CONFORMANCE

																	strtol(3C)