sqrt.cpp

一本很好的C++学习的丛书！初学者必看的

// sqrt.cpp -- use the sqrt() function

#include <iostream>
#include <cmath>    // or math.h

int main()
{
	using namespace std;
	
	double area;
	cout << "Enter the floor area, in square feet, of your home: ";
	cin >> area;
	double side;
	side = sqrt(area);
	cout << "That's the equivalent of a square " << side 
	     << " feet to the side." << endl;
	cout << "How fascinating!" << endl;
	return 0;
}