c语言如何求一元二次方程的根

可以使用以下代码来求解一元二次方程的根：

#include <stdio.h>#include <math.h>int main() {    double a, b, c;    double discriminant, root1, root2;    printf("Enter coefficients a, b and c: ");    scanf("%lf %lf %lf", &a, &b, &c);    discriminant = b * b - 4 * a * c;    if (discriminant > 0) {        root1 = (-b + sqrt(discriminant)) / (2 * a);        root2 = (-b - sqrt(discriminant)) / (2 * a);        printf("Roots are real and different: %.2lf and %.2lf\n", root1, root2);    } else if (discriminant == 0) {        root1 = -b / (2 * a);        root2 = root1;        printf("Roots are real and same: %.2lf and %.2lf\n", root1, root2);    } else {        double realPart = -b / (2 * a);        double imaginaryPart = sqrt(-discriminant) / (2 * a);        printf("Roots are complex and different: %.2lf + %.2lfi and %.2lf - %.2lfi\n", realPart, imaginaryPart, realPart, imaginaryPart);    }    return 0;}

用户输入三个系数 a、b、c，程序计算判别式的值，然后根据判别式的值判断方程的根的情况，并输出结果。