#include <iostream>
using namespace std;

int Max(const int *Numbers, const int Count)
{
	int Maximum = Numbers[0];

	for(int i = 0; i < Count; i++)
		if( Maximum < Numbers[i] )
			Maximum = Numbers[i];

	return Maximum;
}

double Max(const double *Numbers, const int Count)
{
	double Maximum = Numbers[0];

	for(int i = 0; i < Count; i++)
		if( Maximum < Numbers[i] )
			Maximum = Numbers[i];

	return Maximum;
}

int main()
{
	int Nbrs[] = { 12, 483, 748, 35, 478 };
	int Total  = sizeof(Nbrs) / sizeof(int);

	int Maximum = Max(Nbrs, Total);
	cout << "Maximum: " << Maximum << endl;

	return 0;
}

Here is an example of running the program:

Maximum: 748