FLT_EVAL_METHOD
Defined in header <float.h> |
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(since C99) |
Specifies range and precision of floating-point values obtained from floating-point constants and from all operations (operators, implicit conversions of operands) except assignment, cast, and library function call.
| Value | Explanation |
|---|---|
negative values except -1 |
implementation-defined behavior |
-1 |
the default precision is not known |
0 |
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 |
Notes
Regardless 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.
See also
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(C99)(C99)
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most efficient floating-point type at least as wide as float or double (typedef) |
C++ documentation for FLT_EVAL_METHOD |
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