float_t, double_t

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 .

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));
}

FLT_EVAL_METHOD = 1
sizeof(float) = 4
sizeof(float_t) = 8
sizeof(double) = 8
sizeof(double_t) = 8

References

See also