C++ : why does long long 2147483647 + 1 = -2147483648?

C++ : why does long long 2147483647 + 1 = -2147483648?
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C++ : why does long long 2147483647 + 1 = -2147483648?
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does why long 2147483647 + = long -2147483648? C++ 1 :