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std::abs, std::labs, std::llabs, std::imaxabs - cppreference. com Computes the absolute value of the integer number num The behavior is undefined if the result cannot be represented by the return type If std::abs is called with an unsigned integral argument that cannot be converted to int by integral promotion, the program is ill-formed
How to write absolute value in c - Stack Overflow It controls only the presentation of the values that are already there; it cannot alter the values themselves In particular, when you write %u, the corresponding value must already be unsigned; it cannot change a signed value to an unsigned