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129 | .\" ======================================================================== | |
130 | .\" | |
131 | .IX Title "bigrat 3" | |
132 | .TH bigrat 3 "2002-06-01" "perl v5.8.0" "Perl Programmers Reference Guide" | |
133 | .SH "NAME" | |
134 | bigrat \- Transparent BigNumber/BigRational support for Perl | |
135 | .SH "SYNOPSIS" | |
136 | .IX Header "SYNOPSIS" | |
137 | .Vb 1 | |
138 | \& use bigrat; | |
139 | .Ve | |
140 | .PP | |
141 | .Vb 2 | |
142 | \& $x = 2 + 4.5,"\en"; # BigFloat 6.5 | |
143 | \& print 1/3 + 1/4,"\en"; # produces 7/12 | |
144 | .Ve | |
145 | .SH "DESCRIPTION" | |
146 | .IX Header "DESCRIPTION" | |
147 | All operators (inlcuding basic math operations) are overloaded. Integer and | |
148 | floating-point constants are created as proper BigInts or BigFloats, | |
149 | respectively. | |
150 | .PP | |
151 | Other than bignum, this module upgrades to Math::BigRat, meaning that | |
152 | instead of 2.5 you will get 2+1/2 as output. | |
153 | .Sh "\s-1MODULES\s0 \s-1USED\s0" | |
154 | .IX Subsection "MODULES USED" | |
155 | \&\f(CW\*(C`bigrat\*(C'\fR is just a thin wrapper around various modules of the Math::BigInt | |
156 | family. Think of it as the head of the family, who runs the shop, and orders | |
157 | the others to do the work. | |
158 | .PP | |
159 | The following modules are currently used by bignum: | |
160 | .PP | |
161 | .Vb 4 | |
162 | \& Math::BigInt::Lite (for speed, and only if it is loadable) | |
163 | \& Math::BigInt | |
164 | \& Math::BigFloat | |
165 | \& Math::BigRat | |
166 | .Ve | |
167 | .Sh "\s-1MATH\s0 \s-1LIBRARY\s0" | |
168 | .IX Subsection "MATH LIBRARY" | |
169 | Math with the numbers is done (by default) by a module called | |
170 | Math::BigInt::Calc. This is equivalent to saying: | |
171 | .PP | |
172 | .Vb 1 | |
173 | \& use bigrat lib => 'Calc'; | |
174 | .Ve | |
175 | .PP | |
176 | You can change this by using: | |
177 | .PP | |
178 | .Vb 1 | |
179 | \& use bigrat lib => 'BitVect'; | |
180 | .Ve | |
181 | .PP | |
182 | The following would first try to find Math::BigInt::Foo, then | |
183 | Math::BigInt::Bar, and when this also fails, revert to Math::BigInt::Calc: | |
184 | .PP | |
185 | .Vb 1 | |
186 | \& use bigrat lib => 'Foo,Math::BigInt::Bar'; | |
187 | .Ve | |
188 | .PP | |
189 | Please see respective module documentation for further details. | |
190 | .Sh "\s-1SIGN\s0" | |
191 | .IX Subsection "SIGN" | |
192 | The sign is either '+', '\-', 'NaN', '+inf' or '\-inf' and stored seperately. | |
193 | .PP | |
194 | A sign of 'NaN' is used to represent the result when input arguments are not | |
195 | numbers or as a result of 0/0. '+inf' and '\-inf' represent plus respectively | |
196 | minus infinity. You will get '+inf' when dividing a positive number by 0, and | |
197 | \&'\-inf' when dividing any negative number by 0. | |
198 | .Sh "\s-1METHODS\s0" | |
199 | .IX Subsection "METHODS" | |
200 | Since all numbers are not objects, you can use all functions that are part of | |
201 | the BigInt or BigFloat \s-1API\s0. It is wise to use only the \fIbxxx()\fR notation, and not | |
202 | the \fIfxxx()\fR notation, though. This makes you independed on the fact that the | |
203 | underlying object might morph into a different class than BigFloat. | |
204 | .SH "EXAMPLES" | |
205 | .IX Header "EXAMPLES" | |
206 | .Vb 5 | |
207 | \& perl -Mbigrat -le 'print sqrt(33)' | |
208 | \& perl -Mbigrat -le 'print 2*255' | |
209 | \& perl -Mbigrat -le 'print 4.5+2*255' | |
210 | \& perl -Mbigrat -le 'print 3/7 + 5/7 + 8/3' | |
211 | \& perl -Mbigrat -le 'print 12->is_odd()'; | |
212 | .Ve | |
213 | .SH "LICENSE" | |
214 | .IX Header "LICENSE" | |
215 | This program is free software; you may redistribute it and/or modify it under | |
216 | the same terms as Perl itself. | |
217 | .SH "SEE ALSO" | |
218 | .IX Header "SEE ALSO" | |
219 | Especially bignum. | |
220 | .PP | |
221 | Math::BigFloat, Math::BigInt, Math::BigRat and Math::Big as well | |
222 | as Math::BigInt::BitVect, Math::BigInt::Pari and Math::BigInt::GMP. | |
223 | .SH "AUTHORS" | |
224 | .IX Header "AUTHORS" | |
225 | (C) by Tels <http://bloodgate.com/> in early 2002. |