ex0204.cpp

来自「Visual+C+++6[1].0实用教程代码 Visual+C+++6[1]」· C++ 代码 · 共 30 行

// ex0204.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream.h>
#include <math.h>

int main(int argc, char* argv[])
{
double a,b,c,delta;
cout<<"依次输入一元二次方程的系数：";
cin>>a>>b>>c;
delta = b*b - 4*a*c;
if(delta<0)
  cout << "无解\n";
else 
{
	if(delta==0) {
		double x1=-b/(2*a);
		cout << "方程解为：x=" << x1;
	}
	else {
     delta = sqrt(delta);
     double x1 = (-b+delta)/(2*a);
     double x2 = (-b-delta)/(2*a);
     cout << "方程解为：x1 = " << x1 << "  ;  " <<  "x2 = " << x2 << endl;
	}
}
return 0;
}