#include<stdio.h>

#include<math.h>

int main()

{

    printf("请输入a,b,c\n");

    float a, b, c, t, p, q, x1, x2;

    scanf_s("%f%f%f", &a, &b, &c);

    if (a == )

        printf("不是一元二次方程");

    else

    {

        t = b * b -  * a * c;

        if (t >= )

        {

            /*求实根*/

            x1 = (-b + sqrt(t)) / ( * a);

            x2 = (-b - sqrt(t)) / ( * a);

            printf("有实根为\n");

            printf("x1=%f\nx2=%f\n",x1,x2);

        }

        else

        {

            p = (-b) / ( * a);/*求实部*/

            q = sqrt(-t) / ( * a);/*求虚部*/

            printf("有虚根为\n");

            printf("%f+%f i\n", p, q);

            printf("%f-%f i\n", p, q);

        }

    }

}