56 lines
1.6 KiB
Markdown
56 lines
1.6 KiB
Markdown
# Phone Number
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Welcome to Phone Number on Exercism's C Track.
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If you need help running the tests or submitting your code, check out `HELP.md`.
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## Instructions
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Clean up user-entered phone numbers so that they can be sent SMS messages.
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The **North American Numbering Plan (NANP)** is a telephone numbering system used by many countries in North America like the United States, Canada or Bermuda. All NANP-countries share the same international country code: `1`.
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NANP numbers are ten-digit numbers consisting of a three-digit Numbering Plan Area code, commonly known as *area code*, followed by a seven-digit local number. The first three digits of the local number represent the *exchange code*, followed by the unique four-digit number which is the *subscriber number*.
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The format is usually represented as
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```text
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(NXX)-NXX-XXXX
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```
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where `N` is any digit from 2 through 9 and `X` is any digit from 0 through 9.
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Your task is to clean up differently formatted telephone numbers by removing punctuation and the country code (1) if present.
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For example, the inputs
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- `+1 (613)-995-0253`
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- `613-995-0253`
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- `1 613 995 0253`
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- `613.995.0253`
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should all produce the output
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`6139950253`
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**Note:** As this exercise only deals with telephone numbers used in NANP-countries, only 1 is considered a valid country code.
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## Source
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### Created by
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- @RealBarrettBrown
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### Contributed to by
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- @bcc32
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- @Gamecock
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- @gea-migration
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- @h-3-0
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- @mikewalker
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- @patricksjackson
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- @QLaille
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- @ryanplusplus
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- @wolf99
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### Based on
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Event Manager by JumpstartLab - http://tutorials.jumpstartlab.com/projects/eventmanager.html |