#include <iostream>
using namespace std;
#include <cmath>
/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char** argv) {
	//目的：練習數學函數開根號 
	cout<<"請輸入一個數字：";
	int x;
	cin>>x;
	
	double y;
	y = sqrt(x);
	cout<<endl<<x<<"，開根號="<<y<<endl;
	
	return 0;
}