integer wrap-around in src/Ch03/03_09/CodeDemo.cpp

[02de16e2]

Calling the example solution with a = -3, b = 0 and c = 0 yields 1431655764.3333 instead of -1.

This is because the addition is in uint32_t and wraps around.

Since the example solution is apparently used as reference for checking user solutions, correct implementations are rejected:

Something isn't working. 
Your code returned: -1
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* Expected result: 1431655764.3333