typedef /* implementation-defined */ float_t
(since C99)typedef /* implementation-defined */ double_t
(since C99)The types float_t and double_t are floating types at least as wide as float and double, respectively, and such that double_t is at least as wide as float_t. The value of FLT_EVAL_METHOD determines the types of float_t and double_t.
FLT_EVAL_METHOD Explanation â0â float_t and double_t are equivalent to float and double, respectively 1 both float_t and double_t are equivalent to double 2 both float_t and double_t are equivalent to long double other both float_t and double_t are implementation defined [edit] Example
#include <float.h>
#include <math.h>
#include <stdio.h>
#define SHOW(expr) printf("%s = %d\n", #expr, (int)(expr))
int main()
{
SHOW(FLT_EVAL_METHOD);
SHOW(sizeof(float));
SHOW(sizeof(float_t));
SHOW(sizeof(double));
SHOW(sizeof(double_t));
}
Possible output:
FLT_EVAL_METHOD = 1 sizeof(float) = 4 sizeof(float_t) = 8 sizeof(double) = 8 sizeof(double_t) = 8[edit] References
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