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Full Discussion: How to find length of string and pass into char array in C?
Top Forums Programming How to find length of string and pass into char array in C? Post 302525770 by ctsgnb on Saturday 28th of May 2011 07:10:37 AM
Old 05-28-2011
What i have read in one of my book is :

A constant integer written in headecimal form will take the first of the following type whose size is sufficient to represent it correctly : int, unsigned int, long int, unsigned long int.
you can still force the compiler to use a type long or unsigned by adding the L|l or U|u :

0xFFl
0xFFFFu
0xFFFFlu

In the case your constant is positive and exceed the capacity of the type unsigned long int
OR
In the case your constat is negative and is lower than the lowest number that can be represented in with the type int
... then the ANSI norm does not specify the behaviour (so it may depend on the implementation of your compiler, some will truncate bits to only keep those with 'heavy weight' ... some may return strange result...)
 

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LEARN ABOUT REDHAT

bn_zero

BN_zero(3)							      OpenSSL								BN_zero(3)

NAME

       BN_zero, BN_one, BN_value_one, BN_set_word, BN_get_word - BIGNUM assignment operations

SYNOPSIS

	#include <openssl/bn.h>

	int BN_zero(BIGNUM *a);
	int BN_one(BIGNUM *a);

	const BIGNUM *BN_value_one(void);

	int BN_set_word(BIGNUM *a, unsigned long w);
	unsigned long BN_get_word(BIGNUM *a);

DESCRIPTION

       BN_zero(), BN_one() and BN_set_word() set a to the values 0, 1 and w respectively.  BN_zero() and BN_one() are macros.

       BN_value_one() returns a BIGNUM constant of value 1. This constant is useful for use in comparisons and assignment.

       BN_get_word() returns a, if it can be represented as an unsigned long.

RETURN VALUES

       BN_get_word() returns the value a, and 0xffffffffL if a cannot be represented as an unsigned long.

       BN_zero(), BN_one() and BN_set_word() return 1 on success, 0 otherwise.	BN_value_one() returns the constant.

BUGS

       Someone might change the constant.

       If a BIGNUM is equal to 0xffffffffL it can be represented as an unsigned long but this value is also returned on error.

SEE ALSO

       bn(3), BN_bn2bin(3)

HISTORY

       BN_zero(), BN_one() and BN_set_word() are available in all versions of SSLeay and OpenSSL. BN_value_one() and BN_get_word() were added in
       SSLeay 0.8.

       BN_value_one() was changed to return a true const BIGNUM * in OpenSSL 0.9.7.

0.9.7a								    2002-07-18								BN_zero(3)
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