题解 | #计算一元二次方程#

#include<stdio.h>
int main()
{
    float a,b,c;
    while(scanf("%f%f%f",&a,&b,&c) != EOF)
    {

        if(a != 0)
        {
            float date = b*b - (4 * a* c);

            if(date > 0.0)
            {
                printf("x1=%.2f;x2=%.2f\n",(-b - sqrt(date)) / (2*a),
                      (-b + sqrt(date)) / (2*a));
            }
            else if(date == 0.0)
            {
                printf("x1=x2=%.2f\n",(-b) / (2 * a));
            }
            else
            {
                printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n",(-b)/(2*a) , sqrt(-date) / (2 * a),
                      (-b)/(2*a) , sqrt(-date) / (2 * a));
            }
        }
        else
            printf("Not quadratic equation\n");

    }


    return 0;
}