题解 | 计算一元二次方程

#include <math.h>
#include <stdio.h>

int main() 
{
    double a,b,c;
    while(scanf("%lf %lf %lf",&a,&b,&c)!=EOF)
    {
    double delt=(b*b)-(4*a*c);
    if(a!=0.0)
    {
    if(delt==0)
    {

if(-b/(2*a)==-0)
{
   printf("x1=x2=0.00");
}
else {
printf("x1=x2=%.2lf\n",-b/(2*a));
}

    }
    if(delt>0)
    {
        printf("x1=%.2lf;x2=%.2lf\n",(-b-(sqrt(delt)))/(2*a),(-b+(sqrt(delt)))/(2*a));
    }
    if(delt<0)
    {
        printf("x1=%.2lf-%.2lfi;x2=%.2lf+%.2lfi\n",-b/(2*a),sqrt(-delt)/(2*a),-b/(2*a),sqrt(-delt)/(2*a));
    }
    }
    else
    {
        printf("Not quadratic equation\n");
    }
    }
    }