給個(gè)算法的框架,你可以自己細(xì)化.

#include "math.h"
float a, b, c, delta;
scanf("%f,%f,%f", &a, &b, &c);
delta=b*b-4*a*c;
if(delta==0)
{
printf("Result is %5.2f\n", -b/(2*a));
}
else if(delta >0)
{
printf("Result is %5.2f, %5.2f\n", (-b+sqrt(delta))/(2*a),(-b-sqrt(delta))/(2*a));
}
else
{
printf("Result is %5.2f+%5.2fi, %5.2f-%5.2fi\n",
-b/(2*a), sqrt(-delta)/(2*a), -b/(2*a), sqrt(-delta)/(2*a));
}