Monday, August 3

gangnam

daily challenge16

today's brief

December 2014. Gangnam Style becomes the first video to pass 2,147,483,647 views on YouTube, which is exactly the largest number a signed 32-bit integer can hold. The counter rolls over, and Google publicly jokes that they had to upgrade the view count to a 64-bit integer to keep up with Psy. Show what the odometer read the moment it wrapped.

Objective

Return the number a signed 32-bit counter would display for a given real view count, wrapping when it overflows.

Steps

real is the true view count, non-negative.
A signed 32-bit integer holds -2147483648 to 2147483647. If real fits (at most 2147483647), return it unchanged.
If real is larger, return the value it wraps to when stored in that 32-bit integer: take real modulo 4294967296, then subtract 4294967296 if the result is 2147483648 or more.

examples

$ displayed_views(1000)

1000

$ displayed_views(2147483647)

2147483647

$ displayed_views(2147483648)

-2147483648

Constraints

Expected files

views.c

Allowed functions

None. Write every helper yourself.

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Solutions

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