vc0406.cpp

VC面向对象的学习教程

// Example 4-6：解一元二次方程
#include <iostream.h>
#include <math.h>
void main()
{
	double a, b, c, delta, p, q;
	cout << "please intput a, b, c = ?";
	cin >> a >> b >> c;
	delta = b*b-4*a*c;
	p = -b/(2*a);
	q = sqrt(fabs(delta))/(2*a);
	if(delta >= 0)
		cout << endl << "x1 = " << p+q << endl << "x2 = " << p-q << endl;
	else
	{
		cout << endl << "x1 = " << p << " + j" << q;
		cout<< endl << "x2 = " << p << "- j" << q <<endl;
	}
}