#define FLT_EVAL_METHOD /* implementation-defined */
(since C++11)Specifies the precision in which all floating-point arithmetic operations other than assignment and cast are done.
Value Explanation negative values except -1 implementation-defined behavior -1 the default precision is not known â0â all operations and constants evaluate in the range and precision of the type used. Additionally, float_t and double_t are equivalent to float and double respectively 1 all operations and constants evaluate in the range and precision of double. Additionally, both float_t and double_t are equivalent to double 2 all operations and constants evaluate in the range and precision of long double. Additionally, both float_t and double_t are equivalent to long double [edit] NotesRegardless of the value of FLT_EVAL_METHOD, any floating-point expression may be contracted, that is, calculated as if all intermediate results have infinite range and precision (unless #pragma STDC FP_CONTRACT is off).
Cast and assignment strip away any extraneous range and precision: this models the action of storing a value from an extended-precision FPU register into a standard-sized memory location.
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