C语言相关程序

#include<iostream.h>
int max(int a,int b);
int max(int a,int b,int c);
int max(int a,int b,int c,int d);
void main()
{
	cout<<"max="<<max(1,2)<<endl;
	cout<<"max="<<max(1,2,3)<<endl;
	cout<<"max="<<max(1,2,3,4)<<endl;
}
int max(int a,int b)
{
	return a>b?a:b;
}
int max(int a,int b,int c)
{
	return max(a,max(b,c));
}
int max(int a,int b,int c,int d)
{
	return max(a,max(b,c,d));
}