|
An object of the class Gmpz is an arbitrary precision integer based on the Gnu Multiple Precision Arithmetic Library.
#include <CGAL/Gmpz.h>
| Gmpz z; | |
|
creates an uninitialized multiple precision integer z.
| |
| Gmpz z ( int i); | |
|
creates a multiple-precision integer initialized with
i.
| |
| Gmpz z ( double d); | |
|
creates a multiple-precision integer initialized with
the integral part of d.
| |
| Gmpz & | ++ z | prefix increment. |
| Gmpz | z ++ | postfix increment. |
| Gmpz & | -- z | prefix decrement. |
| Gmpz | z -- | postfix decrement. |
| Gmpz | a >> unsigned long i | rightshift by i. |
| Gmpz | a << unsigned long i | leftshift by i. |
| Gmpz & | z >>= long i | rightshift by i, where i>=0. |
| Gmpz & | z <<= long i | leftshift by i, where i>=0. |
| Gmpz | a & b | bitwise AND. |
| Gmpz | a | b | bitwise IOR. |
| Gmpz | a ^ b | bitwise XOR. |
| Gmpz & | z &= b | bitwise AND. |
| Gmpz & | z |= b | bitwise IOR. |
| Gmpz & | z ^= b | bitwise XOR. |
| Sign | z.sign () const | Returns the sign of z. |
| size_t | z.bit_size () const | Returns the bit-size (that is, the number of bits needed to represent the mantissa) of z. |
| size_t | z.size () const | Returns the size in limbs of z. A limb is the type used by Gmp to represent the integer (usually long). |
| size_t | z.approximate_decimal_length () const | |
| Returns the approximate number of decimal digits needed to represent z. Approximate means either a correct result, either the correct result plus one. | ||
| double | z.to_double () const | Returns a double approximation of z. The integer is truncated if needed. If the exponent of the conversion is too big, the result is system dependent (returning infinity where it is supported). |
| std::ostream& | std::ostream& out << z | writes z to the ostream out. |
| std::istream& | std::istream& in >> & z | reads an integer from in, then converts it to a Gmpz. |