题解 | #计算一元二次方程#

#include <stdio.h>
#include <math.h>
int main() 
{
    float a, b,c;
    while (scanf("%f %f %f",&a,&b,&c)==3)
    {
    if(a==0)
    {
        printf("Not quadratic equation\n");
    }
    else 
    
    {
        float data=b*b-4*a*c;
        float result1=(-b+sqrt(data))/(2*a);
        float result2=(-b-sqrt(data))/(2*a);
        if(data>0)
        {
            printf("x1=%.2f;x2=%.2f\n",result2,result1);
        }
        else if(data==0)
        {
            if(result1==0)
            {
                printf("x1=x2=0.00\n");
            }
            else
            {
            printf("x1=x2=%.2f\n",result1);
            }
        }
        else 
        {
            float shibu=-b/(2*a);
            float xubu=sqrt(-data)/(2*a);
            printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n",shibu,xubu,shibu,xubu);
        }
    }   
    }
    
   
    return 0;
}