程式碼^^

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

int main()
{
FILE *fptr;
int n, i;
double a, b, c, D, x1, x2;
fptr=fopen("E:\\in.txt","r");

if(fptr!=NULL)
{
fscanf(fptr,"%d",&n);
while(!feof(fptr))
{
fscanf(fptr,"%lf %lf %lf",&a,&b,&c);
D=b*b-4*a*c;
if (D<0)
printf("none\n");

else if (D==0)
{
x1=(-b)/(2*a);
printf("%.3lf,%.3lf\n", x1, x1);
}

else
{
x1=(-b+sqrt(D))/(2*a);
x2=(-b-sqrt(D))/(2*a);
printf("%.3lf,%.3lf\n", x1,x2);
}
}
}
else
printf("File Opening Failure.");

fclose(fptr);
system("pause");
return 0;
}