韦达定理

#include<iostream>
using namespace std;
int main()
{
    float a = 0., b = 0., c = 0.,x1 = 0., x2 = 0., m = 0.;
    cin >> a, b, c;
    m = b*b - 4 * a*c;
    if (m >= 0) {
        x1 = (-b + sqrt(m)) / (2 * a);
        x2 = (-b - sqrt(m)) / (2 * a);
        cout << x1, x2;
    }
    else cout << "无解";
    system("pause");
    return 0;
}