{

float dr=b*b-4*a*c; c-=d;

if(dr>0)

{

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

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

printf(“x1=%.2f x2=%.2f\n“，x1，x2);

}

if(dr==0)

{

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

printf(“x=%.2f\n“，x1);

}

if(dr