题解 | #计算一元二次方程#

#include <stdio.h>
#include<math.h>
int main() {
   float a,b,c,p,o,i,m,n,y;
   while(scanf("%f %f %f",&a,&b,&c)!=EOF){
   if(a==0){printf("Not quadratic equation");}
p=b*b-4*a*c;
o=(-b+sqrt(p))/(2*a);i=(-b-sqrt(p))/(2*a);
if(p>0&&a!=0){printf("x1=%0.2f;x2=%0.2f",i,o);}
if (p == 0) {
    o = (-b)/(2*a);
    if (o == 0) 
    {printf("x1=x2=0.00\n");}else { printf("x1=x2=%0.2f\n", o);}}
m=-b/(2*a);n=sqrt(-p)/(2*a);
if(p<0){printf("x1=%0.2f-%0.2fi;x2=%0.2f+%0.2fi",m,n,m,n);}
}
}