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<cmath> <ctgmath>

float_t

Floating-point type
Alias of one of the fundamental floating-point types at least as wide as float.

It is the type used by the implementation to evaluate values of type float, as determined by FLT_EVAL_METHOD:

FLT_EVAL_METHODfloat_tdouble_t
0floatdouble
1doubledouble
2long doublelong double
otherimplementation-definedimplementation-defined

Reference