DGtal  0.9.4beta
fraction.cpp
1 
28 #include <iostream>
31 #include "DGtal/arithmetic/LighterSternBrocot.h"
33 
35 
36 using namespace DGtal;
37 
39 
40 void usage( int, char** argv )
41 {
42  std::cerr << "Usage: " << argv[ 0 ] << " <u_0> <u_1> ... <u_k>" << std::endl;
43  std::cerr << "\t - computes the fraction [u_0; u_1, ..., u_k] from its partial quotients." << std::endl;
44 }
45 
49 int main( int argc, char** argv )
50 {
51  if ( argc < 3 )
52  {
53  usage( argc, argv );
54  return 1;
55  }
56 
58  typedef DGtal::int64_t Integer;
59  typedef DGtal::int64_t Quotient;
60  typedef LighterSternBrocot<Integer, Quotient, StdMapRebinder> SB; // the type of the Stern-Brocot tree
61  typedef SB::Fraction Fraction; // the type for fractions
62  typedef std::back_insert_iterator< Fraction > OutputIterator;
64 
66  Fraction f;
67  OutputIterator itback = std::back_inserter( f );
68  for ( Quotient i = 1; i < argc; ++i)
69  {
70  Quotient u = atoll( argv[ i ] );
71  *itback++ = std::make_pair( u, i-1 );
72  }
73  std::cout << "z = " << f.p() << " / " << f.q() << std::endl;
75  return 0;
76 }
77 
DGtal::int32_t Integer
Definition: StdDefs.h:74
DGtal is the top-level namespace which contains all DGtal functions and types.
Aim: The Stern-Brocot tree is the tree of irreducible fractions. This class allows to construct it pr...
boost::int64_t int64_t
signed 94-bit integer.
Definition: BasicTypes.h:74