Шаблоны

[B_N]

#include <iostream>
#include <math.h>
#include <float.h>
using namespace std;

template<typename T> 
bool multiple3(T);

template<> 
bool multiple3(long arg)
{
	return ( (arg % 3) == 0 );
}

template<> 
bool multiple3(double arg)
{
	return ( fabs(fmod(arg, 3)) <= DBL_EPSILON );
}

int main()
{
	long	L1 = 10;
	long	L2 = 12;
	
	double	D1 = 10.0;
	double	D2 = 12.0;
	double	D3 = 12.000001;
	
	boolalpha (cout);
	
	cout 
		<< multiple3(L1) << endl
		<< multiple3(L2) << endl
		<< multiple3(D1) << endl
		<< multiple3(D2) << endl
		<< multiple3(D3) << endl;

	cin.get();
	return 0;
}

false
true
false
true
false