题解 | #计算一元二次方程#
计算一元二次方程
http://www.nowcoder.com/practice/7da524bb452441b2af7e64545c38dc26
#include<stdio.h>
#include<math.h>
int main()
{
float a,b,c;
while(scanf("%f %f %f",&a,&b,&c)!= EOF)
{
if(a==0) printf("Not quadratic equation\n");
else
{
float d=b*b-4*a*c;
if(d==0)
{
printf("x1=x2=%.2f\n",(-b+sqrt(d))/(2*a));
}else if(d>0)
{
printf("x1=%.2f;x2=%.2f\n",(-b-sqrt(d))/(2*a),(-b+sqrt(d))/(2*a));
}else
{
float x = (-b)/(2*a),y = sqrt(-d)/(2*a);
if(x==-0) x=-x;
printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n",x,y,x,y);
}
}
}
return 0;
}