nantest1.c

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#include <math.h>
#include <float.h>
#include <stdio.h>

static double
get_float8_nan(void)
{
	printf("computed NAN\n");
	return (double) (0.0 / 0.0);
}

static double
get_float8_infinity(void)
{
#ifdef INFINITY
	printf("defined INFINITY\n");
	return (double) INFINITY;
#else
	printf("computed INFINITY\n");
	return (double) (HUGE_VAL * HUGE_VAL);
#endif
}

int main(void) {
	double	d;
	d = get_float8_nan();
	printf("%d %d\n", isnan(d), isinf(d));
	d = get_float8_infinity();
	printf("%d %d\n", isnan(d), isinf(d));
	return 0;
}