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Category: | Logic |

Submitted By: | rob77 |

Fun: | (1.94) |

Difficulty: | (2.27) |

You're a computer programmer, and the program you're writing has numeric variables A and B. You need the computer to switch the variables so that the number in variable A becomes variable B, and the number in variable B becomes variable A. Adding a third variable would use more memory though, so how can you do that switch without using another variable? Use commands such as B=B-A to assign a new value to B.

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Posted by royale-ninja | 07/24/12 |

i got it...i solved it by another answer A=B-A B=B-A A=A+B | |

Posted by royale-ninja | 07/24/12 |

i got it...i solved it by another answer A=B-A B=B-A A=A+B :D | |

Posted by edoridlo | 10/14/13 |

How about this way? A = A + B B = A - B A = A - B :D | |

Posted by rob77 | 01/08/14 |

This was a real exercise I got in a course. | |

Posted by Dezaxa | 12/29/14 |

The smart alec answer is to emply some assembler and use registers, e.g. load location of A to register X load location of B to register Y save X to location of B save Y to location of A |

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