# Contains &; stdio.h & ampgt；

# Contains &; math.h & ampgt；

Floating x;

...

if(fabs(x-(int)x)& amp； lt； 1e-8) printf ("X is an integer \ n ");

Elseprintf ("x is not an integer \ n ");

Method 2:

int c=(int)b，d=(int)(b+0.999999)

If (c==d)

Printf ("is an integer \ n");

other

Printf ("non-integer \ n");

Method 3:

Floating b;

...

if(b-(int)b==0)

Printf ("is an integer \ n");

other

Printf ("non-integer \ n");

Method 4:

Floating b;

...

If (b! =(int)b)

Printf ("non-integer \ n");

other

Printf ("is an integer \ n");