这程序那错了吖
#include "stdio.h "
#include "math.h "
main()
{
float a,b,c,d;
printf ( "\n a= ");
scanf ( "%f ",&a);
printf ( "\n b= ");
scanf ( "&f ",&b);
printf ( "\n c= ");
scanf ( "&f ",&c);
printf ( "\n d= ");
scanf ( "&f ",&d);
d= b*b-4*a*c;
if (d> 0)
{
printf( "\n x1=%f ",(-b+sart(d))/(2*a));
printf( "\n x2+%f ",(-b-sart(d))/(2*a));
}
if (d==0) printf( "\n x1=x2%f ",(-b)/(2*a));
if (d <0) printf( "\n The equation has no real root! ");
}

[解决办法]
#include "stdio.h "
#include "math.h "
void main()
{
float a,b,c,d;
printf ( "a= ");
scanf ( "%f ",&a);
printf ( "\nb= ");
scanf ( "%f ",&b);
printf ( "\nc= ");
scanf ( "%f ",&c);

d = b*b-4*a*c;
printf ( "\nd=%f ",d);
if (d> 0)
{
printf( "\nx1=%f\n ",(-b+sqrt(d))/(2*a));
printf( "\nx2=%f\n ",(-b-sqrt(d))/(2*a));
}
if (d==0) printf( "\nx1=x2=%f\n ",(-b)/(2*a));
if (d <0) printf( "\nThe equation has no real root!\n ");
}