oatdr=bb-4absp;c-=d;

if(dr>0)

{

x1=(-b-sqrt(dr))/(2a);

x2=(-b+sqrt(dr))/(2a);

prtf(“x1=2fx2=2f\n“，x1，x2);

}

if(dr==0)

{

x1=(-b+sqrt(dr))/(2a);

prtf(“x