代码如下，可以靠到您的WINTC上试试
#include "Stdio.h"
#include "Conio.h"
#include "math.h"

void main(void)
{
  int a;
  int b;
  int c;
  float v;
  float delta(int a , int b , int c);
  float OneRoot(int a , int b , int c);
  float TwoRoot1(int a , int b, int c);
  float TwoRoot2(int a , int b, int c);
  scanf("%f,%f,%f",&a,&b,&c);
  v=delta(a,b,c);

   if(v<0)
       {
        printf("This Equation has no root");
       }
   else if(v==0)
       {
         float x;
         x=OneRoot(a,b,c);
         printf("The only root is %f",x);
        }
   else if(v>0)
        {
         float x1,x2;
         x1=TwoRoot1(a,b,c);
         x2=TwoRoot2(a,b,c);
         printf("The two root is x1=%f,x2=%f",x1,x2);
        }

        getch();


}

float delta(int a , int b , int c)
   {
    float m;
    m=b*b-4*a*c;
    return m;
    }
float OneRoot(int a , int b, int c)
   {
     float x;
     int w = a*2;
     x=(-b)/w;
     c=c;
     return x;
    }

float TwoRoot1(int a , int b ,int c )
   {
    float x1,d;
    int w = a*2;
    d=delta(a,b,c);
     x1=(-b-sqrt(d))/w;
     return x1;
    }

   
float TwoRoot2(int a , int b, int c )
   {
      float x2,d;
    d=delta(a,b,c);
     x2=(-b+sqrt(d))/(2*a);
     return x2;
    }
 getch();