[ Note: The headers <cstdlib> and <cmath> declare the functions described in this subclause. — end note ]
int abs(int j); long int abs(long int j); long long int abs(long long int j); float abs(float j); double abs(double j); long double abs(long double j);
Effects: The abs functions have the semantics specified in the C standard library for the functions abs, labs, llabs, fabsf, fabs, and fabsl.
Remarks: If abs() is called with an argument of type X for which is_unsigned_v<X> is true and if X cannot be converted to int by integral promotion, the program is ill-formed. [ Note: Arguments that can be promoted to int are permitted for compatibility with C. — end note ]
See also: ISO C 7.12.7.2, 7.22.6.1
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