C++韦达定理解Quadratic Equation

解题思路:韦达定理

注意事项:记得包含头文件<iomanip>

参考代码:

#include<iostream>

#include<cmath>

#include<iomanip>

using namespace std;

int main()

{

double a, b, c;

cin >> a >> b >> c;

double x1, x2;

x1 = (-b + sqrt(b * b - 4 * a * c) )/ (2 * a);

x2 = (-b - sqrt(b * b - 4 * a * c) )/ (2 * a);

if (x1 > x2)cout << fixed<<setprecision(2)<<x1 << " " << x2<<endl;

else if(x1<x2)cout << fixed << setprecision(2)<<x2 << " " << x1 << endl;

return 0;

}