用c++代码写一段计算一元二次方程根的代码

当然可以！以下是用C++代码写的计算一元二次方程根的示例：

#include <iostream>
#include <cmath>

int main() {
    double a, b, c;
    std::cout << "请输入一元二次方程的系数：\n";
    std::cout << "a = ";
    std::cin >> a;
    std::cout << "b = ";
    std::cin >> b;
    std::cout << "c = ";
    std::cin >> c;

    double discriminant = b * b - 4 * a * c;
    if (discriminant > 0) {
        double root1 = (-b + sqrt(discriminant)) / (2 * a);
        double root2 = (-b - sqrt(discriminant)) / (2 * a);
        std::cout << "方程的两个实根为：" << root1 << " 和 " << root2 << std::endl;
    } else if (discriminant == 0) {
        double root = -b / (2 * a);
        std::cout << "方程有一个实根：" << root << std::endl;
    } else {
        std::cout << "方程没有实根！" << std::endl;
    }

    return 0;
}