# Fibonacci in Every Language

Published on 01 November 2018 (Updated: 02 May 2020)

In this article, we’ll tackle the Fibonacci problem, its requirements, and how to test it.

## Description

In mathematics, the Fibonacci numbers are the numbers in the following integer sequence, called the Fibonacci sequence, and characterized by the fact that every number after the first two is the sum of the two preceding ones:

```
1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, ...
```

## Requirements

For this sample program, each solution should leverage dynamic programming to produce this
list up to the nth term. For instance, `./fib 5`

on the command line should output

```
1: 1
2: 1
3: 2
4: 3
5: 5
```

In addition, there should be some error handling for situations where the user
doesn’t supply any input or the user supplies input that is not a number
(i.e. `./fib`

or `./fib hello`

, respectively).

## Testing

Some tests for your program are:

Description | Input | Output |
---|---|---|

No Input | “Usage: please input the count of fibonacci numbers to output” | |

Empty Input | ”” | “Usage: please input the count of fibonacci numbers to output” |

Invalid Input: not a number | word | “Usage: please input the count of fibonacci numbers to output” |

Sample Input: 0 | 0 | |

Sample Input: 1 | 1 | 1: 1 |

Sample Input: 2 | 2 | 1: 1 2: 2 |

Sample Input: 5 | 5 | 1: 1 2: 2 3: 3 4: 4 5: 5 |

Sample Input: 10 | 10 | 1: 1 2: 2 3: 3 4: 4 5: 5 6: 6 7: 7 8: 8 9: 9 10: 10 |

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