isfinite(x)
bool isfinite (float x); bool isfinite (double x); bool isfinite (long double x);
int
float
double
long double
bool
true
false
123456789101112
/* isfinite example */ #include <stdio.h> /* printf */ #include <math.h> /* isfinite, sqrt */ int main() { printf ("isfinite(0.0) : %d\n",isfinite(0.0)); printf ("isfinite(1.0/0.0) : %d\n",isfinite(1.0/0.0)); printf ("isfinite(-1.0/0.0) : %d\n",isfinite(-1.0/0.0)); printf ("isfinite(sqrt(-1.0)): %d\n",isfinite(sqrt(-1.0))); return 0; }
isfinite(0.0) : 1 isfinite(1.0/0.0) : 0 isfinite(-1.0/0.0) : 0 isfinite(sqrt(-1.0)): 0