题解 | #牛牛的计划#

没什么想说的，只想感慨一下：做出来的那一刻心态都快崩了！

#include <math.h>
int main()
{
    float a = 0, b = 0, c = 0;
    float derTa = 0;
    while(scanf("%f %f %f", &a, &b, &c) != EOF)
    {
        
        if(a == 0)
        {
            printf("Not quadratic equation\n");
        }
        else
        {
            derTa = b*b - 4.0*a*c; 
        if(derTa == 0)
        {
            float x = (-1.0*b) / (2.0*a);
            if(!x)
            {
                printf("x1=x2=%.2f\n", x+0);
            }
            else
            {
                printf("x1=x2=%.2f\n",x);
            }
        }
        else if(derTa > 0)
        {
            derTa = sqrt(1.0*b*b - 4.0*a*c);
            float x1 = (-1.0*b - derTa) / (2.0*a);
            float x2 = (-1.0*b + derTa) / (2.0*a);
            printf("x1=%.2f;x2=%.2f\n", x1, x2);
        }
        else if(derTa < 0)
        {
            float shiBu = (-1.0*b) / (2*a);
            float xuBu = sqrt(-1.0 * derTa) / (2*a);
            if(shiBu)
            {
                printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n",
                   shiBu, xuBu, shiBu, xuBu);
            }
            else if(!shiBu)
            {
                printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n",
                   -1.0*shiBu, xuBu, -1.0*shiBu, xuBu);
            }
        }
    }
        }
    return 0;
}