# Difference between revisions of "Recursion"

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− | '''Recursion''' is the repeated application of a procedure or definition. | + | '''Recursion''' is the repeated application of a procedure or definition through reference to itself. |

===In Computing=== | ===In Computing=== | ||

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:3. Write a function to compute any number to the power of a non-negative integer. | :3. Write a function to compute any number to the power of a non-negative integer. | ||

− | == | + | ==External links== |

− | + | [http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-00sc-introduction-to-computer-science-and-programming-spring-2011/unit-1/lecture-6-recursion/ Unit on recursion in free online computer science course from MIT.] | |

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[[Category:Computer Science]] | [[Category:Computer Science]] |

## Revision as of 09:23, 26 February 2013

**Recursion** is the repeated application of a procedure or definition through reference to itself.

### In Computing

Recursion is a technique whereby a function, in order to accomplish a task, calls itself to accomplish part of the task.

Every recursive solution involves two major parts or cases, the second part having three components:

- base case(s), in which the problem is simple enough to be solved directly, and
- recursive case(s). A recursive case has three components:

- 1. divide the problem into one or more simpler or smaller parts of the problem,
- 2. call the function (recursively) on each part, and
- 3. combine the solutions of the parts into a solution for the problem.

These exercises are useful to see examples of recursion:

- 1. Write a function to compute the sum of all numbers from 1 to n.
- 2. Write a function to compute 2 to the power of a non-negative integer.
- 3. Write a function to compute any number to the power of a non-negative integer.

## External links

Unit on recursion in free online computer science course from MIT.