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??????些?????????????????????e??????????????std::abs???????????????????????????????????????小?????int???????????????????????纾�
int min_int = -2147483648; cout< |
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unsigned int __abs(int value) { return (value >= 0) ? value : -value; } |
?????????std::abs????路?????????
????2????????姹�??
#include
unsigned int __abs(int value) |
????????姹�?????????????????std::numeric_limits
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unsigned int __abs(int value) { unsigned int copyed_value = value; return (copyed_value > 0x80000000) ? -value : copyed_value; } |
???????32位??小??int??0x80000000——??位????位?1????位??位??????unsigned int????????????????????????????????位?1??????位????????????-1??16?????????0x80000001????????????????位??位?????????copyed_value?小???????????卸??????
??????1?????copyed_value?????0x80000000??????value?????????????????????????-value????
??????2?????copyed_value?????0x80000000??????value?????小??????????????位??位??????copyed_value?写?????value????????????copyed_value??
??????3?????copyed_value??小??0x80000000?????value???????????alue????copyed_value???伞?
????????????????????2?????3??????????????copyed_value??????????????????????????伪???????????????????巍??????????????????????????????????谩?
????????????????????????????????????????????????????????????????小int?????????????std::abs????????????????????????????????????????????????????????????????小int?????????????????????????????????????????
??????????????????????????????????????娌�??????????????????校???????????????????煤?????
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