1 | /* emacs edit mode for this file is -*- C++ -*- */ |
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2 | /* $Id$ */ |
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3 | |
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4 | ftestSetNameOfGame( bgcd, `" |
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5 | Usage: bgcd [<options>] [<envSpec>] <f> <g> [<realResult>] |
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6 | calculates the positive greatest common divider of canonical |
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7 | forms f and g. f and g should be from a base domain. |
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8 | |
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9 | If the gcd of f and g is already known, the optional canonical |
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10 | form realResult may be used to check the result of the gcd |
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11 | computation. |
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12 | "'`' ) |
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13 | |
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14 | //{{{ docu |
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15 | // |
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16 | // ftestAlgorithm.m4 - ftestAlgorithm test program. |
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17 | // |
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18 | // To create ftestAlgorithm.cc, run m4 using the ftest_util.m4 library in |
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19 | // the following way: |
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20 | // |
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21 | // m4 ftest_util.m4 ftestAlgorithm.m4 > ftestAlgorithm.cc |
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22 | // |
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23 | //}}} |
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24 | |
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25 | ftestPreprocInit(); |
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26 | |
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27 | ftestGlobalInit(); |
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28 | |
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29 | // |
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30 | // - functions. |
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31 | // |
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32 | |
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33 | //{{{ ftestStatusT bgcdCheck ( const CanonicalForm & f, const CanonicalForm & g, const CanonicalForm & result, const CanonicalForm & realResult ) |
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34 | //{{{ docu |
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35 | // |
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36 | // bgcdCheck() - check result of bgcd(). |
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37 | // |
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38 | //}}} |
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39 | ftestStatusT |
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40 | bgcdCheck ( const CanonicalForm & f, const CanonicalForm & g, const CanonicalForm & result, const CanonicalForm & realResult ) |
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41 | { |
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42 | // use old gcd to compare results |
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43 | if ( result != gcd( f, g ) ) { |
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44 | ftestError( CheckError, "new and old gcd differ\n" ); |
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45 | return Failed; |
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46 | } |
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47 | |
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48 | // if realResult is given, use it to compare with result |
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49 | if ( ! realResult.isZero() ) |
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50 | if ( realResult == result ) |
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51 | return Passed; |
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52 | else if ( -realResult == result ) |
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53 | return Passed; |
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54 | else { |
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55 | ftestError( CheckError, "result and real result differ\n" ); |
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56 | return Failed; |
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57 | } |
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58 | |
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59 | if ( result.isZero() ) |
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60 | if ( f.isZero() && g.isZero() ) |
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61 | return Passed; |
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62 | else { |
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63 | ftestError( CheckError, "result is zero but f and g are not\n" ); |
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64 | return Failed; |
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65 | } |
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66 | |
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67 | if ( divides( result, f ) && divides( result, g ) ) |
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68 | if ( bgcd( f/result, g/result ).isOne() ) |
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69 | return Passed; |
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70 | else { |
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71 | ftestError( CheckError, "result is not greatest common divisor\n" ); |
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72 | return Failed; |
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73 | } |
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74 | else { |
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75 | ftestError( CheckError, "result is not a common divisor\n" ); |
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76 | return Failed; |
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77 | } |
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78 | } |
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79 | //}}} |
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80 | |
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81 | // |
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82 | // - main program. |
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83 | // |
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84 | int |
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85 | main ( int argc, char ** argv ) |
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86 | { |
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87 | // initialization |
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88 | ftestMainInit(); |
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89 | |
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90 | // declare input and output variables |
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91 | ftestOutVar( CanonicalForm, result ); |
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92 | ftestInVar( CanonicalForm, f ); |
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93 | ftestInVar( CanonicalForm, g ); |
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94 | ftestInVar( CanonicalForm, realResult ); |
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95 | |
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96 | // process argument list and set environment |
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97 | ftestGetOpts(); |
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98 | ftestGetEnv(); |
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99 | ftestGetInVar( f ); |
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100 | ftestGetInVar( g ); |
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101 | ftestGetInVar( realResult, 0 ); |
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102 | |
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103 | // do the test! |
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104 | ftestRun( |
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105 | result = bgcd( f, g ); ); |
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106 | |
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107 | // do the check |
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108 | ftestCheck( |
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109 | bgcdCheck( f, g, result, realResult ) ); |
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110 | |
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111 | // print results |
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112 | ftestOutput( "bgcd(f, g)", result ); |
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113 | |
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114 | // clean up |
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115 | ftestMainExit(); |
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116 | } |
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