写一个判断是否构成三角形的程序

/*please write a program to check three number if can construct a tryaigle*/
#include <iostream>
using namespace std;

class CheckTriangle
{
public:
	CheckTriangle(int x,int y,int z):a(x),b(y),c(z){}
	void operator()(int x,int y,int z);
private:
	int a,b,c;
};
void CheckTriangle::operator()(int x,int y,int z)
{
	if(x+y>z&&x+z>y&&y+z>x)
		cout<<"all right"<<endl;
	else
		cout<<"error"<<endl;
}
int main()
{
	int a,b,c;
	cout<<"please enter three number"<<endl;cin>>a>>b>>c;
	CheckTriangle one(a,b,c);
	one(a,b,c);
	system("pause");
	return 0;

}