[計程考古題] 一元二次方程

[shmm (shmm的暱稱)]

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

double delta(double a,double b,double c)
{
        return sqrt(b*b-4*a*c);
}

int main(void)
{
        double a,b,c,d,x1,x2;
        double delta(double a,double b,double c);
        printf("請依序輸入各項數值(a,b,c):\n");
        scanf("%lf%lf%lf",&a,&b,&c);
        if(a==0)
        {
                if(b==0 && c==0) printf("無限多解\n");
                if(b==0 && c!=0) printf("無解\n");
                else
                {
                        x1 = -c/b;
                        printf("有一實數解 x=%lf\n",x1);
                }
        }
        else
        {
                d = delta(a,b,c);
                if(d<0) printf("有兩虛根 無解\n");
                else
                {
                        if(d==0)
                        {
                                x1 = -b/(2*a);
                                printf("有一實數解 x=%lf\n",x1);
                        }
                        else
                        {
                                x1 = (-b+d)/(2*a);
                                x2 = (-b-d)/(2*a);
                                printf("有兩時數解 x=%lf 或 x= %lf\n",x1,x2);
                        }
                }
                return 0;
}



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