comparing numbers in a file


 
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Test Your Knowledge in Computers #105
Difficulty: Easy
The programming interface, file abstraction, built-in networking and persistent background processing are all features and capabilities supported by a Unix or Linux OS.
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PROP_NUMBER(3)						   BSD Library Functions Manual 					    PROP_NUMBER(3)

NAME
prop_number, prop_number_create_integer, prop_number_create_unsigned_integer, prop_number_copy, prop_number_size, prop_number_unsigned, prop_number_integer_value, prop_number_unsigned_integer_value, prop_number_equals, prop_number_equals_integer, prop_number_equals_unsigned_integer -- numeric value property object LIBRARY
Property Container Object Library (libprop, -lprop) SYNOPSIS
#include <prop/proplib.h> prop_number_t prop_number_create_integer(int64_t val); prop_number_t prop_number_create_unsigned_integer(uint64_t val); prop_number_t prop_number_copy(prop_number_t number); int prop_number_size(prop_number_t number); bool prop_number_unsigned(prop_number_t number); int64_t prop_number_integer_value(prop_number_t number); uint64_t prop_number_unsigned_integer_value(prop_number_t number); bool prop_number_equals(prop_number_t num1, prop_number_t num2); bool prop_number_equals_integer(prop_number_t number, int64_t val); bool prop_number_equals_unsigned_integer(prop_number_t number, uint64_t val); DESCRIPTION
The prop_number family of functions operate on a numeric value property object type. Values are either signed or unsigned, and promoted to a 64-bit type (int64_t or uint64_t, respectively). It is possible to compare number objects that differ in sign. Such comparisons first test to see if each object is within the valid number range of the other: o Signed numbers that are greater than or equal to 0 can be compared to unsigned numbers. o Unsigned numbers that are less than or equal to the largest signed 64-bit value (INT64_MAX) can be compared to signed numbers. Number objects have a different externalized representation depending on their sign: o Signed numbers are externalized in base-10 (decimal). o Unsigned numbers are externalized in base-16 (hexadecimal). When numbers are internalized, the sign of the resulting number object (and thus its valid range) is determined by a set of rules evaluated in the following order: o If the first character of the number is a '-' then the number is signed. o If the first two characters of the number are '0x' then the number is unsigned. o If the number value fits into the range of a signed number then the number is signed. o In all other cases, the number is unsigned. prop_number_create_integer(int64_t val) Create a numeric value object with the signed value val. Returns NULL on failure. prop_number_create_unsigned_integer(uint64_t val) Create a numeric value object with the unsigned value val. Returns NULL on failure. prop_number_copy(prop_number_t number) Copy a numeric value object. If the supplied object isn't a numeric value, NULL is returned. prop_number_size(prop_number_t number) Returns 8, 16, 32, or 64, representing the number of bits required to hold the value of the object. If the supplied object isn't a numeric value, NULL is returned. prop_number_unsigned(prop_number_t number) Returns true if the numeric value object has an unsigned value. prop_number_integer_value(prop_number_t number) Returns the signed integer value of the numeric value object. If the supplied object isn't a numeric value, zero is returned. Thus, it is not possible to distinguish between ``not a prop_number_t'' and ``prop_number_t has a value of 0''. prop_number_unsigned_integer_value(prop_number_t number) Returns the unsigned integer value of the numeric value object. If the supplied object isn't a numeric value, zero is returned. Thus, it is not possible to distinguish between ``not a prop_number_t'' and ``prop_number_t has a value of 0''. prop_number_equals(prop_number_t num1, prop_number_t num2) Returns true if the two numeric value objects are equivalent. If at least one of the supplied objects isn't a numeric value, false is returned. prop_number_equals_integer(prop_number_t number, int64_t val) Returns true if the object's value is equivalent to the signed value val. If the supplied object isn't a numerical value or if val exceeds INT64_MAX, false is returned. prop_number_equals_unsigned_integer(prop_number_t number, uint64_t val) Returns true if the object's value is equivalent to the unsigned value val. If the supplied object isn't a numerical value or if val exceeds INT64_MAX, false is returned. SEE ALSO
prop_array(3), prop_bool(3), prop_data(3), prop_dictionary(3), prop_object(3), prop_string(3), proplib(3) HISTORY
The proplib property container object library first appeared in NetBSD 4.0. BSD
January 21, 2008 BSD

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