题解 | #计算一元二次方程#

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

int main()
{
    float a, b, c;
    int temp;
    while ((temp = scanf("%f %f %f", &a, &b, &c)) != -1)
    {
        float delta = b * b - 4 * a * c;
        if (a == 0)
        {
            printf("Not quadratic equation\n");
        }
        else if(delta == 0)
        {
            printf("x1=x2=%.2f\n", - b / (2*a)+0);
        }
        else if(delta > 0)
        {
            printf("x1=%.2f;x2=%.2f\n",(-b-sqrt(delta))/(2*a), (-b+sqrt(delta))/(2*a));
        }
        else
        {
            printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi", - b / (2*a), fabs(sqrt(-delta) / (2*a)), - b / (2*a), fabs(sqrt(-delta) / (2*a)) ); 
        }
    }
    return 0;
    
}