56 lines
2.3 KiB
Markdown
56 lines
2.3 KiB
Markdown
# Phone Number
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Write a program that cleans up user-entered phone numbers so that they can be sent SMS messages.
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The rules are as follows:
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- If the phone number is less than 10 digits assume that it is bad
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number
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- If the phone number is 10 digits assume that it is good
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- If the phone number is 11 digits and the first number is 1, trim the 1
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and use the last 10 digits
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- If the phone number is 11 digits and the first number is not 1, then
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it is a bad number
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- If the phone number is more than 11 digits assume that it is a bad
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number
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We've provided tests, now make them pass.
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Hint: Only make one test pass at a time. Disable the others, then flip
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each on in turn after you get the current failing one to pass.
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## Getting Started
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Make sure you have read the [getting started with C++](http://help.exercism.io/getting-started-with-cpp.html)
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page on the [exercism help site](http://help.exercism.io/). This covers
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the basic information on setting up the development environment expected
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by the exercises.
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## Passing the Tests
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Get the first test compiling, linking and passing by following the [three
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rules of test-driven development](http://butunclebob.com/ArticleS.UncleBob.TheThreeRulesOfTdd).
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Create just enough structure by declaring namespaces, functions, classes,
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etc., to satisfy any compiler errors and get the test to fail. Then write
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just enough code to get the test to pass. Once you've done that,
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uncomment the next test by moving the following line past the next test.
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```C++
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#if defined(EXERCISM_RUN_ALL_TESTS)
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```
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This may result in compile errors as new constructs may be invoked that
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you haven't yet declared or defined. Again, fix the compile errors minimally
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to get a failing test, then change the code minimally to pass the test,
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refactor your implementation for readability and expressiveness and then
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go on to the next test.
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Try to use standard C++11 facilities in preference to writing your own
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low-level algorithms or facilities by hand. [CppReference](http://en.cppreference.com/)
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is a wiki reference to the C++ language and standard library. If you
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are new to C++, but have programmed in C, beware of
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[C traps and pitfalls](http://www.slideshare.net/LegalizeAdulthood/c-traps-and-pitfalls-for-c-programmers).
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## Source
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Event Manager by JumpstartLab [view source](http://tutorials.jumpstartlab.com/projects/eventmanager.html)
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