题解 | #计算一元二次方程#

#include <stdio.h>
#include <math.h>
//一元二次方程ax2 + bx + c = 0的根
int main()
{
    float a,b,c;
    //多组输入输入三个数
    while(scanf("%f %f %f",&a,&b,&c) != EOF)
    {
        int gen = b*b - 4*a*c;
        if(0 == a)
            printf("Not quadratic equation\n");
        else if(a != 0)
        {
            if(gen == 0)
            {
                if(b == 0)
                    printf("x1=x2=0.00\n");
                else
                    printf("x1=x2=%.2f\n",-b / (2*a));
            }
                
            else if(gen >0)
                printf("x1=%.2f;x2=%.2f\n",(((-b)-sqrt(gen))/(2*a)),(((-b)+sqrt(gen))/(2*a)));
            else
             {
           printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n", -b / (2*a),sqrt(-gen) / (2*a),-b / (2*a),sqrt(-gen) / (2*a));
             }
        }
    }
    return 0;
}