The computer relies on arithmetic. Here we test a variety of arithmetic
operations expressed as 32 bit two's complement binary numbers (Java's
int).

ArithmeticFixture | |||||

x | y | + | - | * | / |

0 | 0 | 0 | 0 | 0 | 0 |

1 | 2 | 3 | -1 | 2 | 0.5 |

1 | -1 | 0 | 2 | -1 | -1 |

10000 | 10000 | 20000 | 0 | 100000000 | 1 |

100000 | 100000 | 200000 | 0 | 10000000000 | 1 |

1000000 | 1000000 | 2000000 | 0 | 1000000000000 | 1 |

Now we try something similar using automatic type conversion offered by ColumnFixtures.

ArithmeticColumnFixture | ||||

x | y | plus() | times() | divide() |

2 | 3 | 5 | 6 | 0.666667 |

200 | 300 | 500 | 60000 | 0.666667 |

2 | 3 | 10 | 10 | 10 |

200 | 3 | 5 | 6 | 0.666667 |

2 | -3 | -1 | -6 | -0.666667 |

Summary |

Document prepaired by Ward Cunningham

First Version July 11, 2002

Last Update August 17, 2002